Internet Explorer Team Blog

  • IEBlog

    Internet Explorer and Connection Limits

    From time to time, I've heard the question: "Why can IE only download two files from the same site simultaneously?" Some more savvy users observe that this limitation probably makes sense in dialup cases where bandwidth is constrained or when lots of small files are being downloaded, since the TCP/IP slow start algorithm comes into play. But for those of us lucky enough to be on broadband, this limitation can be annoying. If I want to download a large number of large files, I have to sit around...
  • IEBlog

    Updated Documentation on Controlling Security Restrictions

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 Our documentation team has just completed updating our documentation covering how administrators and developers can control certain features. This includes the following articles: About Zone Elevation Introduction to Feature Controls About URL Security Zone Templates These documents are useful in understanding the security work undertaken in Windows XP SP2...
  • IEBlog

    Understanding the Windows lifecycle policy (for all you IT Pros out there)

    With so many customers relying on IE, it helps to get a solid grasp of the Windows Lifecycle Policy , which at first blush can appear to be a bit cryptic. Fortunately I think I can shed some light on Microsoft’s policy with these simple rules: We support the version of IE that shipped with an OS or Service Pack for as long as the OS or Service Pack is supported We support the latest standalone version of IE (that’d be IE 6 SP1) on every OS that’s still supported (unless superseded by a newer version...
  • IEBlog

    Internet Explorer Compatibility Evaluator

    My name is Tariq Sharif and I am a program manager in the IE security and networking team. I joined IE team shortly after Windows XP Service Pack 2 was released. Windows XP Service Pack 2 introduced many new security features for Internet Explorer, which can cause compatibility issues for some web applications and sites. In order to help solve such issues I am pleased to announce that the Internet Explorer Compatibility Evaluator (IECE) is now available. IECE is released as part of Microsoft Application...
  • IEBlog

    A HTTP Detective Story by Eric Lawrence

    As a little kid, my dad read with me a lot; we usually read detective stories. While of questionable literary merit, those books developed in me a burning desire to figure stuff out, to pull back the curtain, to understand the mysterious. I still maintain that curiosity today-- I joined the IE team because I wanted to learn the browser inside out, and I developed Microsoft Fiddler to expose the secrets of HTTP in a user-friendly way. I recently came across a bug in the bug database for IE7 which...
  • IEBlog

    IE and Standards

    First of all, I’d like to introduce myself. My name is Chris Wilson; I’m the lead program manager for the web platform in IE. (I am NOT Chris Wilson the drummer for Good Charlotte. :^) ) I joined the IE team shortly before we shipped IE 2.0 in 1995, and worked in various releases for every major release from then until IE 6.0’s release in 2001. After IE 6.0 shipped, I worked on the Avalon project until I decided to rejoin the IE team four months ago. During my tenure on the IE team, I’ve frequently...
  • IEBlog

    Mark of the Web

    With the Local Machine Zone Lockdown introduced in Windows XP SP2 an HTML file on your hard drive will no longer be able to run script and active content without user permissions being granted through the information bar and an additional prompt. This is part of the work to ensure that if you do get bad content on your machine it cannot run with elevated privileges and do nefarious things. Users should exercise caution whenever the information bar appears and be sure that this is really content they...
  • IEBlog

    Internet Explorer and Accessibility

    Since this is my first post on the IE Blog, I wanted to introduce myself. My name is Kelly Ford and I’m part of the test team responsible for testing the user experience in IE. I also head up our accessibility testing efforts. Today I wanted to talk about three aspects of accessibility as they relate to IE and Windows in general. First is access to the Windows OS for individuals with disabilities, second are a couple of hints for users of screen readers using IE in XPSP2 and finally is a request...
  • IEBlog

    Netscape 8 Beta, the IE Platform, and the IE Browser

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 I haven’t tried the Netscape beta yet, but I have read that it allows users to switch between the Gecko rendering engine (the one used in Firefox) and Internet Explorer’s rendering engine. I think this a good opportunity to write about the Windows Web Browsing Platform (the IE Platform) and its counterpart, the IE Browser. The Browser is easy to explain. It’s the blue...
  • IEBlog


    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 We received some good questions about how the JScript engine works in IE. What version of JScript is supported? The version of JScript included with IE6 is EcmaScript edition 3 compliant. I’ve seen some confusion recently with some even claiming that we do not support EcmaScript. In fact JScript, JavaScript and EcmaScript are all basically the same language with a different...
  • IEBlog

    IE7 Platforms and Outlook Express

    We’ve seen lots of questions about the IE7 announcement. Many of these we are not ready to answer and discuss at this time but there are two things that I can offer clarification on. Platforms. We currently plan to make IE7 available for Windows XP SP2 and later. This will therefore include availability not only for the 32bit version of Windows XP SP2 but also for Windows XP Professional x64 Edition and Windows Server 2003 SP1 both of which are due to be released soon. As Dean commented in his original...
  • IEBlog

    What have you guys been doing since IE6?

    Before I answer this, I want to acknowledge that we have a problem if people are asking this question. Listing what we’ve done or our priorities will help but won’t address the problem. Responding to specific questions with a great product and great documentation (for developers, for IT professionals, for deployment specialists, and for other customers as well), and doing that consistently for as long as we’ve been quiet about IE will help more. So, what happened after Microsoft released IE6? Mostly...
  • IEBlog

    IE7 Comments Recap

    Wow, there are a lot of comments. I wanted to recap the main themes I read in the comments and use them as a roadmap for the topics that we will post about over the next few weeks. What have you guys been doing since IE6? What makes IE7 on Win2K so hard anyway? Standards, standards, standards… say something! What’s in IE7, or at least when can we find out? Don’t you understand that your product is fundamentally not secure because of (blank) and you should rip (blank) out? (I want to call out a comment...
  • IEBlog

    Listening to Customers

    My job is focused on receiving feedback from customers and there’s plenty of it. Feedback comes from a great many sources including corporate customers, product support teams, critical problem resolution teams, newsgroups, blogs, ISVs, web developers, colleagues, friends and family. One of the challenges of working on what is arguably the most used piece of software in the world is that there is such a broad array of customers with many different requirements. There are three broad categories of...
  • IEBlog


    The information published in this post is now out-of-date. —IEBlog Editor, 21 August 2012 Today at RSA, Bill Gates talked about Internet Explorer 7. As the guy responsible for IE, I wanted to say a couple of things about it. First, some basics: we’re committing to deliver a new version of Internet Explorer for Windows XP customers. Betas of IE7 will be available this summer. This new release will build on the work we did in Windows XP SP2 and (among other things) go further to defend users...
  • IEBlog

    Table Rendering

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 A comment from Dave P on this blog touched on the interesting aspect of table rendering. Dave said “ IE renders pages differently from, say firefox. One of the noticeable differences is that IE waits for the entire page before displaying it. “ Actually this is not true and you can se from going to many pages that Internet Explorer does support progressive rendering of...
  • IEBlog

    February IE Security Updates Released

    Yesterday’s security updates for February 2005 include two critical updates relating to Internet Explorer: MS05-013 – has a fix for an issue with the DHTML edit control (CAN-2004-1319) MS05-014 - Cumulative Security Update for Internet Explorer These are both rated “critical” and affect all supported IE configurations from IE5.01 to IE6 for XPSP2. In addition, there is a third update to mention - MS05-008 - which contains a fix for a drag-and-drop vulnerability in the Windows shell code. You need...
  • IEBlog

    Security Issues That Aren’t – Part 2

    Part 1 of Security Issues That Aren't gave rise to a lot of interesting comments. Hearing back from you is really helpful in terms of understanding what issues folks are dealing with and where we need to focus our attention. To those of you who suggested I should worry more about security issues that are instead of those that aren’t : I do! That’s exactly why I chose the subject: The fewer non-security reports I need to investigate, the more time I can spend on more severe problems. So bear with...
  • IEBlog

    IE content-type logic

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 This being my first post on the IE blog, I should introduce myself quickly. My name is Vishu Gupta; I am a developer on the IE team. There have been several posts in the recent past asking for more information on how does Internet Explorer sniff the content-type of a downloaded file. The whole thing looks totally inconsistent or should I say...non-compliant! Before reaching...
  • IEBlog

    Http Debugging with Fiddler

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 We’ve just published an MSDN article on a tool called Fiddler . As the article explains it is very useful for http debugging and was written by Eric Lawrence one of the Program Managers on the IE team. Thanks -Dave
  • IEBlog

    IE Security Zones

    Greetings. My name is Mike Friedman. I’m on the Internet Explorer Security Test Team. In IE, the different areas of the Web are partitioned into a set of security zones. The topic I would like to talk about is programmatically adding sites to those zones. Zones were introduced in IE4 as a way to give users and admins more control, to strike a balance between user experience and gradations of risk. If you have a high degree of trust in a site, placing it in a lower-security zone can reduce the number...
  • IEBlog

    New IE Security News Group Launches

    The information published in this post is now out-of-date and one or more links are invalid. —IEBlog Editor, 21 August 2012 There is now a new forum for discussions related to IE security: Here’s the initial posting: Welcome Everyone, This newsgroup is dedicated to the discussion of Internet Explorer security issues. Questions/comments about browser security features, security updates, and IE security best practice are all topics for discussion here...
  • IEBlog

    New Community Article

    On the Internet Explorer Community site there’s a new article covering personalising your browser by one of our Internet Explorer MVPs. There are some great tips there that the novice user might find very useful. This is part of a series of articles on the community site and I’d particularly call attention to the article Help Protect Yourself from Online Crime that has great advice whatever browser you use. Feedback and ideas for articles are appreciated. Thanks -Dave
  • IEBlog

    IE Setup - From IExpress to Windows Package Installer

    My name is John Hrvatin and I’m the Program Manager for Internet Explorer setup. That includes installers for security updates as well as integrating IE into Windows setup for future releases. In the past, IE has used IExpress as its installer. With the release of security update MS04-038 in October 2004, however, IE has begun using the Windows Package Installer, or “update.exe”, for all IE security updates and hot fixes on the following platforms: • Windows 2000 (all service pack levels) • Windows...
  • IEBlog

    The 64-bit browser in Windows x64

    With the delivery of RC 1 of Windows Server 2003 & Windows x64 Client last month, we shipped not one but two browsers with the OS: a 32- and 64-bit version of IE6 for Windows Server 2003 SP1/x64. We had to make a choice with the 64-bit client as to which browser, the 32-bit or 64-bit, would be the default. Compatibility, performance, and interoperability all played a part in our decision, but ultimately our decision was swayed by the lack of 64-bit native controls. We found that in our own every...
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