Internet Explorer
Other names
  • Microsoft Internet Explorer
  • Windows Internet Explorer
  • IE
Original author(s)Thomas Reardon
Initial releaseAugust 24, 1995; 28 years ago (1995-08-24)[1] (included with Plus! for Windows 95)
Stable release(s)
Windows11.0.1000[2] Edit this on Wikidata / 13 December 2022
macOS5.2.3[3] Edit this on Wikidata / 16 June 2003
EnginesMSHTML (Trident), Chakra
Operating systemWindows (previously supported: Mac OS X, Solaris, HP-UX)
PlatformIA-32, x86-64, ARMv7 (previously supported: MIPS, Alpha, PowerPC, 68k, SPARC, PA-RISC, Itanium)
Included with
SuccessorMicrosoft Edge
Standard(s)HTML5, CSS3, WOFF, SVG, RSS, Atom, JPEG XR
Available in95 languages[4]
LicenseProprietary, requires a Windows license[5]

Internet Explorer[a] (formerly Microsoft Internet Explorer[b] and Windows Internet Explorer,[c] commonly abbreviated as IE or MSIE) is a retired series of graphical web browsers developed by Microsoft that were used in the Windows line of operating systems. While IE has been discontinued on most Windows editions, it remains supported on certain editions of Windows, such as Windows 10 LTSB/LTSC.[6] Starting in 1995, it was first released as part of the add-on package Plus! for Windows 95 that year. Later versions were available as free downloads or in-service packs and included in the original equipment manufacturer (OEM) service releases of Windows 95 and later versions of Windows. Microsoft spent over US$100 million per year on Internet Explorer in the late 1990s,[7] with over 1,000 people involved in the project by 1999.[8][9] New feature development for the browser was discontinued in 2016[10] and ended support on June 15, 2022 for Windows 10 Semi-Annual Channel (SAC), in favor of its successor, Microsoft Edge.

Internet Explorer was once the most widely used web browser, attaining a peak of 95% usage share by 2003.[11] It has since fallen out of general use after retirement. This came after Microsoft used bundling to win the first browser war against Netscape, which was the dominant browser in the 1990s. Its usage share has since declined with the launches of Firefox (2004) and Google Chrome (2008) and with the growing popularity of mobile operating systems such as Android and iOS that do not support Internet Explorer. Microsoft Edge, IE's successor, first overtook Internet Explorer in terms of market share in November 2019. Versions of Internet Explorer for other operating systems have also been produced, including an Xbox 360 version called Internet Explorer for Xbox and for platforms Microsoft no longer supports: Internet Explorer for Mac and Internet Explorer for UNIX (Solaris and HP-UX), and an embedded OEM version called Pocket Internet Explorer, later rebranded Internet Explorer Mobile, made for Windows CE, Windows Phone, and, previously, based on Internet Explorer 7, for Windows Phone 7.

The browser has been scrutinized throughout its development for its use of third-party technology (such as the source code of Spyglass Mosaic, used without royalty in early versions) and security and privacy vulnerabilities, and the United States and the European Union have determined that the integration of Internet Explorer with Windows has been to the detriment of fair browser competition.

Internet Explorer 7 was supported on Windows Embedded Compact 2013 until October 10, 2023.[12] The core of Internet Explorer 11 will continue being shipped and supported until at least 2029 as IE Mode, a feature of Microsoft Edge, enabling Edge to display web pages using Internet Explorer 11's Trident layout engine and other components.[13] Through IE Mode, the underlying technology of Internet Explorer 11 partially exists on versions of Windows that do not support IE11 as a proper application, including newer versions of Windows 10, as well as Windows 11, Windows Server Insider Build 22463 and Windows Server Insider Build 25110.[14]


Internet Explorer 1[edit]

Internet Explorer 1
Logo for Internet Explorer 2

The Internet Explorer project was started in the summer of 1994 by Thomas Reardon,[15] who, according to former project lead Ben Slivka,[16] used source code from Spyglass, Inc. Mosaic, which was an early commercial web browser with formal ties to the pioneering National Center for Supercomputing Applications (NCSA) Mosaic browser.[17][18] In late 1994, Microsoft licensed Spyglass Mosaic for a quarterly fee plus a percentage of Microsoft's non-Windows revenues for the software.[18] Although bearing a name like NCSA Mosaic, Spyglass Mosaic had used the NCSA Mosaic source code sparingly.[19]

The first version, dubbed Microsoft Internet Explorer, was installed as part of the Internet Jumpstart Kit in the Microsoft Plus! pack for Windows 95.[20] The Internet Explorer team began with about six people in early development.[19][21] Internet Explorer 1.5 was released several months later for Windows NT and added support for basic table rendering. By including it free of charge with their operating system, they did not have to pay royalties to Spyglass Inc, resulting in a lawsuit and a US$8 million settlement on January 22, 1997.[17][18]

Microsoft was sued by SyNet Inc. in 1996, for trademark infringement, claiming it owned the rights to the name "Internet Explorer."[22] It ended with Microsoft paying $5 million to settle the lawsuit.[23]

Internet Explorer 2[edit]

Internet Explorer 2 is the second major version of Internet Explorer, released on November 22, 1995, for Windows 95 and Windows NT, and on April 23, 1996, for Apple Macintosh[24] and Windows 3.1.[25]

Internet Explorer 3[edit]

Internet Explorer 3 is the third major version of Internet Explorer, released on August 13, 1996, for Microsoft Windows and on January 8, 1997, for Apple Mac OS.

Internet Explorer 4[edit]

Internet Explorer 4 is the fourth major version of Internet Explorer, released in September 1997 for Microsoft Windows, Mac OS, Solaris, and HP-UX. It was the first version of Internet Explorer to use the Trident web engine.

Internet Explorer 5[edit]

Internet Explorer 5 is the fifth major version of Internet Explorer, released on March 18, 1999, for Windows 3.1, Windows NT 3, Windows 95, Windows NT 4.0 SP3, Windows 98, Mac OS X (up to v5.2.3), Classic Mac OS (up to v5.1.7), Solaris and HP-UX (up to 5.01 SP1).

Internet Explorer 6[edit]

Internet Explorer 6 is the sixth major version of Internet Explorer, released on August 24, 2001, for Windows NT 4.0 SP6a, Windows 98, Windows 2000, Windows ME and as the default web browser for Windows XP and Windows Server 2003.

Internet Explorer 7[edit]

Internet Explorer 7 is the seventh major version of Internet Explorer, released on October 18, 2006, for Windows XP SP2, Windows Server 2003 SP1 and as the default web browser for Windows Vista, Windows Server 2008 and Windows Embedded POSReady 2009. IE7 introduces tabbed browsing.

Internet Explorer 8[edit]

Internet Explorer 8 is the eighth major version of Internet Explorer, released on March 19, 2009, for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 and as the default web browser for Windows 7 (later default was Internet Explorer 11) and Windows Server 2008 R2.

Internet Explorer 9[edit]

Internet Explorer 9 is the ninth major version of Internet Explorer, released on March 14, 2011, for Windows 7, Windows Server 2008 R2, Windows Vista Service Pack 2 and Windows Server 2008 SP2 with the Platform Update.

Internet Explorer 10[edit]

Internet Explorer 10 is the tenth major version of Internet Explorer, released on October 26, 2012, and is the default web browser for Windows 8 and Windows Server 2012. It became available for Windows 7 SP1 and Windows Server 2008 R2 SP1 in February 2013.

Internet Explorer 11[edit]

Internet Explorer 11 is featured in Windows 8.1, Windows Server 2012 R2 and Windows RT 8.1, which was released on October 17, 2013. It includes an incomplete mechanism for syncing tabs. It is a major update to its developer tools,[26][27] enhanced scaling for high DPI screens,[28] HTML5 prerender and prefetch,[29] hardware-accelerated JPEG decoding,[30] closed captioning, HTML5 full screen,[31] and is the first Internet Explorer to support WebGL[32][33][34] and Google's protocol SPDY (starting at v3).[35] This version of IE has features dedicated to Windows 8.1, including cryptography (WebCrypto),[26] adaptive bitrate streaming (Media Source Extensions)[36] and Encrypted Media Extensions.[31]

Internet Explorer 11 was made available for Windows 7 users to download on November 7, 2013, with Automatic Updates in the following weeks.[37]

Internet Explorer 11's user agent string now identifies the agent as "Trident" (the underlying browser engine) instead of "MSIE." It also announces compatibility with Gecko (the browser engine of Firefox).

Microsoft claimed that Internet Explorer 11, running the WebKit SunSpider JavaScript Benchmark, was the fastest browser as of October 15, 2013.[38]

Internet Explorer 11 was made available for Windows Server 2012 and Windows Embedded 8 Standard, the only still supported edition of Windows 8 in April 2019.[39]

End of life[edit]

Microsoft Edge was officially unveiled on January 21, 2015 as "Project Spartan."[40][41] On April 29, 2015, Microsoft announced that Microsoft Edge would replace Internet Explorer as the default browser in Windows 10.[42] However, Internet Explorer remained the default web browser on the Windows 10 Long Term Servicing Channel (LTSC) and on Windows Server until 2021, primarily for enterprise purposes.[43][44][45][46]

Internet Explorer is still installed in Windows 10 to maintain compatibility with older websites and intranet sites that require ActiveX and other legacy web technologies.[40][41] The browser's MSHTML rendering engine also remains for compatibility reasons.

Additionally, Microsoft Edge shipped with the "Internet Explorer mode" feature, which enables support for legacy internet applications. This is possible through use of the Trident MSHTML engine, the rendering code of Internet Explorer.[47][48] Microsoft has committed to supporting Internet Explorer mode at least through 2029, with a one-year notice before it is discontinued.[49]

With the release of Microsoft Edge, the development of new features for Internet Explorer ceased. Internet Explorer 11 was the final release, and Microsoft began the process of deprecating Internet Explorer. During this process, it will still be maintained as part of Microsoft's support policies.[10]

Since January 12, 2016, only the latest version of Internet Explorer available for each version of Windows has been supported.[50][51] At the time, nearly half of Internet Explorer users were using an unsupported version.[52]

In February 2019, Microsoft Chief of Security Chris Jackson recommended that users stop using Internet Explorer as their default browser.[53]

Various websites have dropped support for Internet Explorer. On June 1, 2020, the Internet Archive removed Internet Explorer from its list of supported browsers, due to the browser's dated nature.[54] Since November 30, 2020, the web version of Microsoft Teams can no longer be accessed using Internet Explorer 11, followed by the remaining Microsoft 365 applications since August 17, 2021.[55][56] WordPress also dropped support for the browser in July 2021.[57]

Microsoft disabled the normal means of launching Internet Explorer in Windows 11 and later versions of Windows 10,[58] but it is still possible for users to launch the browser from the Control Panel's browser toolbar settings or via PowerShell.[59]

On June 15, 2022, Internet Explorer 11 support ended for the Windows 10 Semi-Annual Channel (SAC). Users on these versions of Windows 10 were redirected to Microsoft Edge starting on February 14, 2023, and visual references to the browser (such as icons on the taskbar) would have been removed on June 13, 2023. However, on May 19, 2023 various organizations disapproved, leading Microsoft to withdraw the change.[60][61] Other versions of Windows that were still supported at the time were unaffected. Specifically, Windows 7 ESU, Windows 8.x, Windows RT; Windows Server 2008/R2 ESU, Windows Server 2012/R2 and later; and Windows 10 LTSB/LTSC continued to receive updates until their respective end of life dates.[62][63][64][65]

On other versions of Windows, Internet Explorer will still be supported until their own end of support dates. IE7 was supported until October 10, 2023 alongside the end of support for Windows Embedded Compact 2013, while IE9 was supported until January 9, 2024 alongside the end of ESU support for Azure customers on Windows Server 2008.[51] Barring additional changes to the support policy, Internet Explorer 11 will be supported until January 13, 2032, concurrent with the end of support for Windows 10 IoT Enterprise LTSC 2021.[66][51]


Page zoom as seen in IE11. The lowest allowed manual zoom level is 10%, and the highest 1000%.[67]

Internet Explorer has been designed to view a broad range of web pages and provide certain features within the operating system, including Microsoft Update. During the height of the browser wars, Internet Explorer superseded Netscape only when it caught up technologically to support the progressive features of the time.[68][better source needed]

Standards support[edit]

Internet Explorer, using the MSHTML (Trident) browser engine:

Internet Explorer uses DOCTYPE sniffing to choose between standards mode and a "quirks mode" in which it deliberately mimics nonstandard behaviors of old versions of MSIE for HTML and CSS rendering on screen (Internet Explorer always uses standards mode for printing). It also provides its own dialect of ECMAScript called JScript.

Internet Explorer was criticized by Tim Berners-Lee for its limited support for SVG, which is promoted by W3C.[72]

Non-standard extensions[edit]

Internet Explorer has introduced an array of proprietary extensions to many of the standards, including HTML, CSS, and the DOM. This has resulted in several web pages that appear broken in standards-compliant web browsers and has introduced the need for a "quirks mode" to allow for rendering improper elements meant for Internet Explorer in these other browsers.

Internet Explorer has introduced several extensions to the DOM that have been adopted by other browsers.

These include the inner HTML property, which provides access to the HTML string within an element, which was part of IE 5 and was standardized as part of HTML 5 roughly 15 years later after all other browsers implemented it for compatibility,[73] the XMLHttpRequest object, which allows the sending of HTTP request and receiving of HTTP response, and may be used to perform AJAX, and the designMode attribute of the content Document object, which enables rich text editing of HTML documents.[citation needed] Some of these functionalities were not possible until the introduction of the W3C DOM methods. Its Ruby character extension to HTML is also accepted as a module in W3C XHTML 1.1, though it is not found in all versions of W3C HTML.

Microsoft submitted several other features of IE for consideration by the W3C for standardization. These include the 'behavior' CSS property, which connects the HTML elements with JScript behaviors (known as HTML Components, HTC), HTML+TIME profile, which adds timing and media synchronization support to HTML documents (similar to the W3C XHTML+SMIL), and the VML vector graphics file format. However, all were rejected, at least in their original forms; VML was subsequently combined with PGML (proposed by Adobe and Sun), resulting in the W3C-approved SVG format, one of the few vector image formats being used on the web, which IE did not support until version 9.[74]

Other non-standard behaviors include: support for vertical text, but in a syntax different from W3C CSS3 candidate recommendation, support for a variety of image effects[75] and page transitions, which are not found in W3C CSS, support for obfuscated script code, in particular JScript.Encode,[76] as well as support for embedding EOT fonts in web pages.[77]


Support for favicons was first added in Internet Explorer 5.[78] Internet Explorer supports favicons in PNG, static GIF and native Windows icon formats. In Windows Vista and later, Internet Explorer can display native Windows icons that have embedded PNG files.[79][80]

Usability and accessibility[edit]

Internet Explorer makes use of the accessibility framework provided in Windows. Internet Explorer is also a user interface for FTP, with operations similar to Windows Explorer. Internet Explorer 5 and 6 had a side bar for web searches, enabling jumps through pages from results listed in the side bar.[81] Pop-up blocking and tabbed browsing were added respectively in Internet Explorer 6 and Internet Explorer 7. Tabbed browsing can also be added to older versions by installing MSN Search Toolbar or Yahoo Toolbar.


Internet Explorer caches visited content in the Temporary Internet Files folder to allow quicker access (or offline access) to previously visited pages. The content is indexed in a database file, known as Index.dat. Multiple Index.dat files exist which index different content—visited content, web feeds, visited URLs, cookies, etc.[82]

Prior to IE7, clearing the cache used to clear the index but the files themselves were not reliably removed, posing a potential security and privacy risk. In IE7 and later, when the cache is cleared, the cache files are more reliably removed, and the index.dat file is overwritten with null bytes.

Caching has been improved in IE9.[83]

Group Policy[edit]

Internet Explorer is fully configurable using Group Policy. Administrators of Windows Server domains (for domain-joined computers) or the local computer can apply and enforce a variety of settings on computers that affect the user interface (such as disabling menu items and individual configuration options), as well as underlying security features such as downloading of files, zone configuration, per-site settings, ActiveX control behavior and others. Policy settings can be configured for each user and for each machine. Internet Explorer also supports Integrated Windows Authentication.


The architecture of IE8. Previous versions had a similar architecture, except that both tabs and the UI were within the same process. Consequently, each browser window could have only one "tab process."

Internet Explorer uses a componentized architecture built on the Component Object Model (COM) technology. It consists of several major components, each of which is contained in a separate dynamic-link library (DLL) and exposes a set of COM programming interfaces hosted by the Internet Explorer main executable, iexplore.exe:[84]

Internet Explorer compared to Firefox on the Acid3 HTML rendering test

Internet Explorer does not include any native scripting functionality. Rather, MSHTML.dll exposes an API that permits a programmer to develop a scripting environment to be plugged-in and to access the DOM tree. Internet Explorer 8 includes the bindings for the Active Scripting engine, which is a part of Microsoft Windows and allows any language implemented as an Active Scripting module to be used for client-side scripting. By default, only the JScript and VBScript modules are provided; third party implementations like ScreamingMonkey (for ECMAScript 4 support) can also be used. Microsoft also makes available the Microsoft Silverlight runtime that allows CLI languages, including DLR-based dynamic languages like IronPython and IronRuby, to be used for client-side scripting.

Internet Explorer 8 introduced some major architectural changes, called loosely coupled IE (LCIE). LCIE separates the main window process (frame process) from the processes hosting the different web applications in different tabs (tab processes). A frame process can create multiple tab processes, each of which can be of a different integrity level, each tab process can host multiple web sites. The processes use asynchronous inter-process communication to synchronize themselves. Generally, there will be a single frame process for all web sites. In Windows Vista with protected mode turned on, however, opening privileged content (such as local HTML pages) will create a new tab process as it will not be constrained by protected mode.[86]


Internet Explorer exposes a set of Component Object Model (COM) interfaces that allows add-ons to extend the functionality of the browser.[84] Extensibility is divided into two types: Browser extensibility and content extensibility. Browser extensibility involves adding context menu entries, toolbars, menu items or Browser Helper Objects (BHO). BHOs are used to extend the feature set of the browser, whereas the other extensibility options are used to expose that feature in the user interface. Content extensibility adds support for non-native content formats.[84] It allows Internet Explorer to handle new file formats and new protocols, e.g. WebM or SPDY.[84] In addition, web pages can integrate widgets known as ActiveX controls which run on Windows only but have vast potentials to extend the content capabilities; Adobe Flash Player and Microsoft Silverlight are examples.[84] Add-ons can be installed either locally, or directly by a web site.

Since malicious add-ons can compromise the security of a system, Internet Explorer implements several safeguards. Internet Explorer 6 with Service Pack 2 and later feature an Add-on Manager for enabling or disabling individual add-ons, complemented by a "No Add-Ons" mode. Starting with Windows Vista, Internet Explorer and its BHOs run with restricted privileges and are isolated from the rest of the system. Internet Explorer 9 introduced a new component – Add-on Performance Advisor. Add-on Performance Advisor shows a notification when one or more of installed add-ons exceed a pre-set performance threshold. The notification appears in the Notification Bar when the user launches the browser. Windows 8 and Windows RT introduce a Metro-style version of Internet Explorer that is entirely sandboxed and does not run add-ons at all.[87] In addition, Windows RT cannot download or install ActiveX controls at all; although existing ones bundled with Windows RT still run in the traditional version of Internet Explorer.[87]

Internet Explorer itself can be hosted by other applications via a set of COM interfaces. This can be used to embed the browser functionality inside a computer program or create Internet Explorer shells.[84]


Internet Explorer uses a zone-based security framework that groups sites based on certain conditions, including whether it is an Internet- or intranet-based site as well as a user-editable whitelist. Security restrictions are applied per zone; all the sites in a zone are subject to the restrictions.

Internet Explorer 6 SP2 onwards uses the Attachment Execution Service of Microsoft Windows to mark executable files downloaded from the Internet as being potentially unsafe. Accessing files marked as such will prompt the user to make an explicit trust decision to execute the file, as executables originating from the Internet can be potentially unsafe. This helps in preventing the accidental installation of malware.

Internet Explorer 7 introduced the phishing filter, which restricts access to phishing sites unless the user overrides the decision. With version 8, it also blocks access to sites known to host malware. Downloads are also checked to see if they are known to be malware-infected.

In Windows Vista, Internet Explorer by default runs in what is called Protected Mode, where the privileges of the browser itself are severely restricted—it cannot make any system-wide changes. One can optionally turn this mode off, but this is not recommended. This also effectively restricts the privileges of any add-ons. As a result, even if the browser or any add-on is compromised, the damage the security breach can cause is limited.

Patches and updates to the browser are released periodically and made available through the Windows Update service, as well as through Automatic Updates. Although security patches continue to be released for a range of platforms, most feature additions and security infrastructure improvements are only made available on operating systems that are in Microsoft's mainstream support phase.

On December 16, 2008, Trend Micro recommended users switch to rival browsers until an emergency patch was released to fix a potential security risk which "could allow outside users to take control of a person's computer and steal their passwords.” Microsoft representatives countered this recommendation, claiming that "0.02% of internet sites" were affected by the flaw. A fix for the issue was released the following day with the Security Update for Internet Explorer KB960714, on Microsoft Windows Update.[88][89]

In 2010, Germany's Federal Office for Information Security, known by its German initials, BSI, advised "temporary use of alternative browsers" because of a "critical security hole" in Microsoft's software that could allow hackers to remotely plant and run malicious code on Windows PCs.[90]

In 2011, a report by Accuvant, funded by Google, rated the security (based on sandboxing) of Internet Explorer worse than Google Chrome but better than Mozilla Firefox.[91][92]

A 2017 browser security white paper comparing Google Chrome, Microsoft Edge, and Internet Explorer 11 by X41 D-Sec in 2017 came to similar conclusions, also based on sandboxing and support of legacy web technologies.[93]

Security vulnerabilities[edit]

Internet Explorer has been subjected to many security vulnerabilities and concerns such that the volume of criticism for IE is unusually high. Much of the spyware, adware, and computer viruses across the Internet are made possible by exploitable bugs and flaws in the security architecture of Internet Explorer, sometimes requiring nothing more than viewing of a malicious web page to install themselves. This is known as a "drive-by install.” There are also attempts to trick the user into installing malicious software by misrepresenting the software's true purpose in the description section of an ActiveX security alert.

A number of security flaws affecting IE originated not in the browser itself, but in ActiveX-based add-ons used by it. Because the add-ons have the same privilege as IE, the flaws can be as critical as browser flaws. This has led to the ActiveX-based architecture being criticized for being fault-prone. By 2005, some experts maintained that the dangers of ActiveX had been overstated and there were safeguards in place.[94] In 2006, new techniques using automated testing found more than a hundred vulnerabilities in standard Microsoft ActiveX components.[95] Security features introduced in Internet Explorer 7 mitigated some of these vulnerabilities.

In 2008, Internet Explorer had a number of published security vulnerabilities. According to research done by security research firm Secunia, Microsoft did not respond as quickly as its competitors in fixing security holes and making patches available.[96] The firm also reported 366 vulnerabilities in ActiveX controls, an increase from the previous year.

According to an October 2010 report in The Register, researcher Chris Evans had detected a known security vulnerability which, then dating back to 2008, had not been fixed for at least six hundred days.[97] Microsoft says that it had known about this vulnerability, but it was of exceptionally low severity as the victim web site must be configured in a peculiar way for this attack to be feasible at all.[98]

In December 2010, researchers were able to bypass the "Protected Mode" feature in Internet Explorer.[99]

Vulnerability exploited in attacks on U.S. firms[edit]

The most used web browser by country in 2020[100]

In an advisory on January 14, 2010, Microsoft said that attackers targeting Google and other U.S. companies used software that exploits a security hole, which had already been patched, in Internet Explorer. The vulnerability affected Internet Explorer 6 from on Windows XP and Server 2003, IE6 SP1 on Windows 2000 SP4, IE7 on Windows Vista, XP, Server 2008, and Server 2003, IE8 on Windows 7, Vista, XP, Server 2003, and Server 2008 (R2).[101]

The German government warned users against using Internet Explorer and recommended switching to an alternative web browser, due to the major security hole described above that was exploited in Internet Explorer.[102] The Australian and French Government issued a similar warning a few days later.[103][104][105][106]

Major vulnerability across versions[edit]

On April 26, 2014, Microsoft issued a security advisory relating to CVE-2014-1776 (use-after-free vulnerability in Microsoft Internet Explorer 6 through 11[107]), a vulnerability that could allow "remote code execution" in Internet Explorer versions 6 to 11.[108] On April 28, 2014, the United States Department of Homeland Security's United States Computer Emergency Readiness Team (US-CERT) released an advisory stating that the vulnerability could result in "the complete compromise" of an affected system.[109] US-CERT recommended reviewing Microsoft's suggestions to mitigate an attack or using an alternate browser until the bug is fixed.[110][111] The UK National Computer Emergency Response Team (CERT-UK) published an advisory announcing similar concerns and for users to take the additional step of ensuring their antivirus software is up to date.[112] Symantec, a cyber security firm, confirmed that "the vulnerability crashes Internet Explorer on Windows XP."[113] The vulnerability was resolved on May 1, 2014, with a security update.[114]

Market adoption and usage share[edit]

Usage share of web browsers according to StatCounter
Historical market share of Internet Explorer

The adoption rate of Internet Explorer seems to be closely related to that of Microsoft Windows, as it is the default web browser that comes with Windows. Since the integration of Internet Explorer 2.0 with Windows 95 OSR 1 in 1996, and especially after version 4.0's release in 1997, the adoption was greatly accelerated: from below 20% in 1996, to about 40% in 1998, and over 80% in 2000. This made Microsoft the winner in the infamous 'first browser war' against Netscape. Netscape Navigator was the dominant browser during 1995 and until 1997, but rapidly lost share to IE starting in 1998, and eventually slipped behind in 1999. The integration of IE with Windows led to a lawsuit by AOL, Netscape's owner, accusing Microsoft of unfair competition. The infamous case was eventually won by AOL but by then it was too late, as Internet Explorer had already become the dominant browser.

Internet Explorer peaked during 2002 and 2003, with about 95% share. Its first notable competitor after beating Netscape was Firefox from Mozilla, which itself was an offshoot from Netscape.

Firefox 1.0 had surpassed Internet Explorer 5 in early 2005, with Firefox 1.0 at 8 percent market share.[115]

Approximate usage over time based on various usage share counters averaged for the year overall, or for the fourth quarter, or for the last month in the year depending on availability of reference.[116][117][118][119][120][121]

According to StatCounter, Internet Explorer's market share fell below 50% in September 2010.[122] In May 2012, Google Chrome overtook Internet Explorer as the most used browser worldwide, according to StatCounter.[123]

Industry adoption[edit]

Browser Helper Objects are also used by many search engines companies and third parties for creating add-ons that access their services, such as search engine toolbars. Because of the use of COM, it is possible to embed web-browsing functionality in third-party applications. Hence, there are several Internet Explorer shells, and several content-centric applications like RealPlayer also use Internet Explorer's web browsing module for viewing web pages within the applications.


While a major upgrade of Internet Explorer can be uninstalled in a traditional way if the user has saved the original application files for installation, the matter of uninstalling the version of the browser that has shipped with an operating system remains a controversial one.

The idea of removing a stock install of Internet Explorer from a Windows system was proposed during the United States v. Microsoft Corp. case. One of Microsoft's arguments during the trial was that removing Internet Explorer from Windows may result in system instability. Indeed, programs that depend on libraries installed by IE, including Windows help and support system, fail to function without IE. Before Windows Vista, it was not possible to run Windows Update without IE because the service used ActiveX technology, which no other web browser supports.[124][125]

Impersonation by malware[edit]

The popularity of Internet Explorer led to the appearance of malware abusing its name. On January 28, 2011, a fake Internet Explorer browser calling itself "Internet Explorer – Emergency Mode" appeared. It closely resembled the real Internet Explorer but had fewer buttons and no search bar. If a user attempted to launch any other browser such as Google Chrome, Mozilla Firefox, Opera, Safari, or the real Internet Explorer, this browser would be loaded instead. It also displayed a fake error message, claiming that the computer was infected with malware and Internet Explorer had entered "Emergency Mode.” It blocked access to legitimate sites such as Google if the user tried to access them.[126][127]

See also[edit]


  1. ^ In versions 10 and 11
  2. ^ In version 6 and earlier
  3. ^ In versions 7, 8, and 9


  1. ^ "The History of Internet Explorer". News Center. Microsoft. August 25, 2005. Archived from the original on October 1, 2005.
  2. ^ "Microsoft Update-Katalog". Retrieved December 5, 2020.
  3. ^ "Mactopia: Download: Internet Explorer 5.2.3 for Mac OS X". Archived from the original on March 19, 2004.
  4. ^ "Internet Explorer 10 for Windows 7 released in 95 languages – Microsoft Language Portal Blog".
  5. ^ "Microsoft Pre-Release Software License Terms: Internet Explorer 11 Developer Preview". Microsoft. Retrieved July 27, 2013.
  6. ^ "Internet Explorer 11 desktop app retirement FAQ". TECHCOMMUNITY.MICROSOFT.COM. May 19, 2021. Retrieved February 20, 2023.
  7. ^ "Victor: Software empire pays high price". CNET News. Archived from the original on February 21, 2021. Retrieved October 17, 2008.
  8. ^ "The rise, fall, and rehabilitation of Internet Explorer". Archived from the original on June 26, 2015. Retrieved February 6, 2015.
  9. ^ Paul Maritz. "U.S. Antitrust Case 98-1232". Retrieved February 6, 2015. There is talk about how we get more $'s from the 1000+ people we have working on browser related stuff...
  10. ^ a b "Frequently Asked Questions". Microsoft Edge Development. Microsoft. Archived from the original on July 16, 2016. The latest features and platform updates will only be available in Microsoft Edge. We will continue to deliver security updates to Internet Explorer 11 through its supported lifespan. To ensure consistent behavior across Windows versions, we will evaluate Internet Explorer 11 bugs for servicing on a case by case basis.
  11. ^ "Microsoft's Internet Explorer losing browser share". BBC News.
  12. ^ "Internet Explorer 7 - Microsoft Lifecycle". Retrieved November 12, 2023.
  13. ^ "What is Internet Explorer (IE) mode?". March 2, 2022. Archived from the original on June 13, 2022. Retrieved June 13, 2022.
  14. ^ Tom Warren (June 25, 2021). "Windows 11 is deleting Internet Explorer". The Verge. Retrieved August 12, 2021.
  15. ^ "Thomas Reardon, 34". MIT Technology Review. Archived from the original on February 25, 2021. Retrieved January 18, 2015.
  16. ^ "Internet Explorer: A Brief History [6/2022 update]". Ben Slivka. May 28, 2021. Archived from the original on June 22, 2022. Retrieved August 7, 2023.
  17. ^ a b Elstrom, Peter (January 22, 1997). "Microsoft's $8 Million Goodbye to Spyglass". Businessweek. Bloomberg L.P. Archived from the original on June 29, 1997. Retrieved February 9, 2011.
  18. ^ a b c Thurrott, Paul (January 22, 1997). "Microsoft and Spyglass kiss and make up". IT Pro. Penton. Archived from the original on September 19, 2012. Retrieved February 9, 2011.
  19. ^ a b "Memoirs From the Browser Wars". Retrieved October 17, 2008.
  20. ^ "The History of Internet Explorer". Microsoft. Archived from the original on October 1, 2005. Retrieved February 16, 2008.
  21. ^ Borland, John (April 15, 2003). "Software empire pays high price". CNET News. CBS Interactive. Retrieved February 9, 2011.
  22. ^ Goodwins, Rupert (August 15, 1996). "Microsoft sued by minnow over Internet Explorer name". ZDNet. Archived from the original on January 1, 2016. Retrieved May 30, 2022.
  23. ^ "Microsoft Settles 'IE' Suit For $5M". July 2, 1998. Retrieved February 5, 2022.
  24. ^ "Chronology of Personal Computers (1996)". Retrieved February 5, 2022.
  25. ^ "Microsoft Internet Explorer Web Browser Available on All Major Platforms, Offers Broadest International Support". Stories. April 30, 1996. Retrieved February 5, 2022.
  26. ^ a b Thurrott, Paul (July 25, 2013). "Internet Explorer 11 Developer Preview for Windows 7". Paul Thurrott's SuperSite for Windows. Penton. Archived from the original on July 26, 2013. Retrieved July 26, 2013.
  27. ^ "What's new in F12 Tools (Preliminary)". MSDN. Microsoft. June 26, 2013. Retrieved July 13, 2013.
  28. ^ "High DPI support (Preliminary)". MSDN. Microsoft. July 25, 2013. Retrieved July 26, 2013.
  29. ^ "Prerender and prefetch support (Preliminary)". MSDN. Microsoft. July 25, 2013. Retrieved July 26, 2013.
  30. ^ Bradley, Tony (July 26, 2013). "Why Internet Explorer 11 is the right browser for business". PC World. IDG. Retrieved July 27, 2013.
  31. ^ a b Brinkmann, Martin (July 25, 2013). "The Internet Explorer 11 Preview for Windows 7 is now available". ghacks Technology News. Archived from the original on July 27, 2013. Retrieved July 27, 2013.
  32. ^ "Latest Windows 8.1 build beefs up IE developer tools". CNET. CBS Interactive. Retrieved May 29, 2013.
  33. ^ "Microsoft teases Internet Explorer 11 WebGL support on Vine". The Verge. May 22, 2013. Retrieved May 29, 2013.
  34. ^ "WebGL (Preliminary)". MSDN. Microsoft. July 25, 2013. Retrieved July 26, 2013.
  35. ^ Lardinois, Frederic (June 26, 2013). "Microsoft Confirms IE11 Will Support Google's SPDY Protocol". TechCrunch. Aol. Retrieved September 10, 2013.
  36. ^ Williams, Mike (July 26, 2013). "Internet Explorer 11 Developer Preview now available for Windows 7". BetaNews. BetaNews, Inc. Retrieved July 27, 2013.
  37. ^ "IE11 for Windows 7 Globally Available for Consumers and Businesses". Retrieved November 8, 2013.
  38. ^ "WebKit SunSpider JavaScript Benchmark Results". Archived from the original on October 23, 2013. Retrieved October 23, 2013.
  39. ^ "Bringing Internet Explorer 11 to Windows Server 2012 and Windows Embedded 8 Standard". January 28, 2019. Retrieved March 26, 2019.
  40. ^ a b Weber, Jason (January 21, 2015). "Spartan and the Windows 10 January Preview Build". IEBlog. Microsoft. Archived from the original on January 22, 2015.
  41. ^ a b Warren, Tom (January 27, 2015). "Microsoft reveals its Internet Explorer successor will support extensions". The Verge. Vox Media.
  42. ^ Goldman, David (April 29, 2015). "'Microsoft Edge' will replace Internet Explorer". CNN. Retrieved January 3, 2023.
  43. ^ "Microsoft is killing off the Internet Explorer brand". The Verge. Vox Media. March 17, 2015. Retrieved March 18, 2015.
  44. ^ "What's new in the Windows Server 2019 Insider Preview Builds". Archived from the original on December 10, 2019. Retrieved February 12, 2019.
  45. ^ "What's new in Windows 10 Enterprise LTSC 2021". Microsoft. December 9, 2022. Retrieved January 3, 2023.
  46. ^ "What's new in Windows Server 2022". Microsoft. December 14, 2022. Retrieved January 3, 2023.
  47. ^ "What is Internet Explorer mode?". Retrieved October 12, 2021.
  48. ^ Blog, Windows Experience (May 19, 2021). "The future of Internet Explorer on Windows 10 is in Microsoft Edge". Windows Experience Blog. Retrieved May 20, 2021.
  49. ^ "Lifecycle FAQ - Internet Explorer and Microsoft Edge". Retrieved October 12, 2021.
  50. ^ "Stay up-to-date with Internet Explorer". Microsofts's MSDN blog. August 7, 2014. Archived from the original on August 8, 2014. Retrieved January 3, 2023.
  51. ^ a b c "Internet Explorer Support Lifecycle Policy FAQ". Retrieved March 18, 2015.
  52. ^ Keizer, Gregg (December 1, 2015). "Nearly 370M IE users have just 6 weeks to upgrade". Computerworld. Retrieved January 3, 2023.
  53. ^ Jackson, Chris (February 6, 2019). "The perils of using Internet Explorer as your default browser". Windows IT Pro Blog. Microsoft. Retrieved May 14, 2020.
  54. ^ "Farewell to IE11". Internet Archive Blogs. Internet Archive. May 1, 2020. Retrieved May 14, 2020.
  55. ^ "Microsoft Internet Explorer is finally dead". The Independent. August 20, 2020. Retrieved March 26, 2021.
  56. ^ "Microsoft 365 apps say farewell to Internet Explorer 11 and Windows 10 sunsets Microsoft Edge Legacy". Retrieved September 18, 2020.
  57. ^ Desrosiers, Jonathan (May 19, 2021). "Dropping support for Internet Explorer 11". WordPress. Retrieved January 3, 2023.
  58. ^ "Internet Explorer 11 desktop app retirement FAQ". Retrieved November 13, 2023.
  59. ^ Warren, Tom (August 3, 2022). "You can bring Internet Explorer back to life in Windows 11 if you're a glutton for punishment". Vox Media, LLC. Retrieved October 22, 2022. It's just a matter of searching for Internet Options in the Start menu, launching the control panel applet, selecting the programs tab, hitting "manage add-ons," and then clicking the "Learn more about toolbars and extensions." For some reason, this launches Internet Explorer, bypassing the commands that force you into Edge.
  60. ^ "Lifecycle FAQ - Internet Explorer and Microsoft Edge". November 3, 2021. Archived from the original on June 13, 2022. Retrieved June 13, 2022.
  61. ^ "Internet Explorer 11 desktop app retirement FAQ". Microsoft. June 13, 2022. Archived from the original on June 13, 2022. Retrieved June 13, 2022.
  62. ^ "Internet Explorer 11 desktop app retirement FAQ". TECHCOMMUNITY.MICROSOFT.COM. May 19, 2021. Retrieved June 15, 2022.
  63. ^ Taylor, Josh (June 15, 2022). "Microsoft to retire Internet Explorer browser and redirect users to Edge". The Guardian.
  64. ^ "Lifecycle FAQ - Internet Explorer and Microsoft Edge". Retrieved July 10, 2021.
  65. ^ "Microsoft is finally getting rid of its most-hated product". CNN. May 20, 2021. Retrieved May 20, 2021.
  66. ^ "Windows 10 IoT Enterprise LTSC 2021". Microsoft. Retrieved January 3, 2023.
  67. ^ "How to set the zoom level in Internet Explorer 9 - Browsers". January 25, 2022. You can zoom from 10% to 1,000%.
  68. ^ Brian wilson. "Netscape Navigator — Browser History: Netscape explains that by the fourth generations of both browsers, Internet Explorer had caught up technologically with Netscape's browser ... Netscape 6.0 was considered slow and buggy, and adoption was slow to occur". Retrieved September 26, 2010.
  69. ^ "Internet Explorer 8 Beta 1 Whitepapers". MSDN. Archived from the original on March 9, 2008. Retrieved March 11, 2008.
  70. ^ Hopkins, James. "IE8 Bugs". Archived from the original on August 1, 2009.
  71. ^ "Summary results of W3C test suite on multiple browsers, different versions and browser plugins". Retrieved April 15, 2011.
  72. ^ Svensson, Peter (September 10, 2008). "Creator of Web spots a flaw in Internet Explorer". NBC News. Retrieved November 16, 2008.
  73. ^ "innerHTML and compatibility".
  74. ^ Schiller, Jeff. "SVG Support Tables". Retrieved April 20, 2019.
  75. ^ "Filter Tool (WebFX)". May 12, 2005. Archived from the original on October 16, 2010. Retrieved October 4, 2008.
  76. ^ "Using Script Encoder". Microsoft Docs. Microsoft. October 24, 2011. Retrieved April 20, 2019.
  77. ^ "Font Embedding for the Web". Microsoft Typography. Microsoft. February 26, 2001. Archived from the original on April 28, 2005. Retrieved April 20, 2019.
  78. ^ "How to Add a Shortcut Icon to a Web Page". MSDN. Microsoft. Archived from the original on December 17, 2008. Retrieved April 20, 2019.
  79. ^ Davis, Jeff (December 27, 2007). "why doesn't the favicon for my site appear in IE7?". jeffdav on code. Retrieved March 11, 2013.
  80. ^ "Fun with Favicons". Microsoft Developer Network. Microsoft. September 7, 2013. Retrieved April 20, 2019.
  81. ^ Shultz, Greg (October 9, 2002). "Internet Explorer's Search Assistant gives you plenty of search options". Tech Republic. Retrieved October 11, 2021.
  82. ^ Windows Core Networking Team (August 4, 2006). "A bit about WinInet's Index.dat". Microsoft Developer Network. Microsoft. Archived from the original on January 12, 2008. Retrieved April 20, 2019.
  83. ^ "Internet Explorer 9 Network Performance Improvements". Microsoft Developer Network. Microsoft. March 17, 2011. Retrieved April 20, 2019.
  84. ^ a b c d e f "Internet Explorer Architecture". MSDN. Retrieved January 10, 2007.
  85. ^ Wilson, Chris. "Inside IE8 Beta 1 for Developers". MSDN Channel9. Retrieved March 7, 2008.
  86. ^ Zeigler, Andy (March 11, 2008). "IE8 and Loosely Coupled IE". Microsoft Developer Network. Microsoft. Retrieved April 20, 2019.
  87. ^ a b McSherry, Tony (January 20, 2013). "A look at Internet Explorer 10 on Windows RT". TechRepublic. CBS Interactive.
  88. ^ "Security risk detected in Internet Explorer software". Belfast Telegraph. December 16, 2008.
  89. ^ "Serious security flaw found in IE". BBC News. December 16, 2008. Retrieved May 5, 2010.
  90. ^ Wingfield, Nick; McGroarty, Patrick (January 19, 2010). "Business Technology: Microsoft's Internet Explorer Is Under Fire in Europe". The Wall Street Journal.
  91. ^ Goodin, Dan (December 9, 2011). "Chrome is the most secured browser – new study". The Register. Retrieved October 15, 2012.
  92. ^ "Accuvant Study Finds Chrome is Most Secure Browser". eSecurity Planet. December 13, 2011. Retrieved May 22, 2012.
  93. ^ "Browser Security White Paper" (PDF). X41-Dsec GmbH. September 18, 2017. Retrieved September 21, 2017.
  94. ^ Seltzer, Larry (April 14, 2005). "The Lame Blame of ActiveX". Security—Opinions. eWeek. Retrieved April 7, 2006.
  95. ^ Lemos, Robert (July 31, 2006). "ActiveX security faces storm before calm". Security Focus. Retrieved July 11, 2009.
  96. ^ "Secunia 2008 Report" (PDF). Secunia.
  97. ^ Goodin, Dan (November 1, 2010). "Internet Explorer info leak festers for 2 years". The Register. San Francisco. Retrieved November 2, 2010.
  98. ^ Naraine, Ryan (November 1, 2010). "Two-year-old data leakage flaw still haunts Internet Explorer". ZDNet. CBS Interactive. Archived from the original on November 4, 2010. Retrieved November 2, 2010.
  99. ^ "Researchers bypass Internet Explorer Protected Mode". The Register. December 3, 2010. Retrieved December 4, 2010.
  100. ^ "Browser Market Share Worldwide - September 2019". Statcounter. September 2019. Retrieved October 19, 2019.
  101. ^ Mills, Elinor (January 14, 2010). "New IE hole exploited in attacks on U.S. firms". CNET News. CBS Interactive. Archived from the original on December 24, 2013. Retrieved September 26, 2010.
  102. ^ Emery, Daniel (January 16, 2010). "Germany issues Explorer warning". BBC News. Retrieved March 26, 2010.
  103. ^ Fildes, Jonathan (January 18, 2010). "France in fresh Explorer warning". BBC News. Retrieved March 26, 2010.
  104. ^ Emily Bourke for AM (January 19, 2010). "Govt issues IE security warning". Retrieved September 26, 2010.
  105. ^ Martinez-Cabrera, Alejandro (January 18, 2010). "The Technology Chronicles : France and Germany warn users not to use Internet Explorer". The San Francisco Chronicle.
  106. ^ Govan, Fiona (January 18, 2010). "Germany warns against using Microsoft Internet Explorer". The Daily Telegraph. London. Archived from the original on January 11, 2022. Retrieved March 26, 2010.
  107. ^ "CVE-2014-1776". Common Vulnerabilities and Exposures (CVE). January 29, 2014. Archived from the original on April 30, 2017. Retrieved May 16, 2017.
  108. ^ "Microsoft Security Advisory 2963983". Microsoft. April 26, 2014. Retrieved April 28, 2014.
  109. ^ Finkle, Jim (April 28, 2014). "U.S., UK advise avoiding Internet Explorer until bug fixed". Reuters. Retrieved April 28, 2014.
  110. ^ "Microsoft Internet Explorer Use-After-Free Vulnerability Guidance". United States Computer Emergency Readiness Team. April 28, 2014. Retrieved April 28, 2014.
  111. ^ "Vulnerability Note VU#222929 – Microsoft Internet Explorer use-after-free vulnerability". Carnegie Mellon University. April 27, 2014. Retrieved April 28, 2014.
  112. ^ "U.S.: Stop using Internet Explorer until security holes are fixed". Chicago Tribune. April 28, 2014. Retrieved April 28, 2014.
  113. ^ "Microsoft warns of Internet Explorer flaw". BBC. April 28, 2014. Retrieved April 28, 2014.
  114. ^ "Microsoft Security Bulletin MS14-021 – Critical Security Update for Internet Explorer (2965111)". Microsoft Technet. May 1, 2014. Retrieved July 6, 2014.
  115. ^ "Market share for browsers, operating systems and search engines".
  116. ^ "Market share for browsers, operating systems and search engines". Retrieved February 9, 2011.
  117. ^ Borland, John. Browser wars: High price, huge rewards, ZDNet, April 15, 2003. Accessed June 2, 2012.
  118. ^ " The Full-Featured Web Counter with Graphic Reports and Detailed Information". Archived from the original on October 3, 2008. Retrieved October 17, 2008.
  119. ^ " The Full-Featured Web Counter with Graphic Reports and Detailed Information". Archived from the original on October 2, 2008. Retrieved October 17, 2008.
  120. ^ "CNN — Behind the numbers: Browser market share — October 8, 1998". Archived from the original on August 16, 2000. Retrieved October 17, 2008.
  121. ^ "Web Analytics | Online Business Optimization by Omniture". Archived from the original on April 20, 2008. Retrieved October 17, 2008.
  122. ^ Goldman, David (October 6, 2010). "Internet Explorer usage falls below 50%". CNN. Retrieved October 6, 2010.
  123. ^ "Google Chrome Overtakes Internet Explorer". PCWorld. May 21, 2012. Retrieved January 19, 2019.
  124. ^ "Business Week Online/Microsoft Watch". November 3, 1999. Archived from the original on November 3, 1999. Retrieved November 16, 2023.
  125. ^ McCullagh, Declan (January 15, 2011). "Feds Accuse MS of Falsification". Wired. Archived from the original on January 15, 2011. Retrieved November 16, 2023.
  126. ^ "IE Emergency Mode". January 28, 2011. Archived from the original on June 30, 2011. Retrieved June 23, 2013.
  127. ^ "Bleeping Computer – Fake IE Emergency Mode (by fake AVG)". January 28, 2011. Retrieved June 23, 2013.

Further reading[edit]

External links[edit]