Last October, we launched a rewritten code base for the Gmail user interface to Internet Explorer 7 and Firefox 2 users. Since then, we've added support for Safari 3 and Firefox 3 and improved performance in other browsers. This new code base included major performance improvements and provided us with a solid foundation for launching new features such as colored labels, group chat and rich emoticons, invisible mode, AIM integration, Gmail Labs, an updated contact manager, and remote sign out.
The newest version of Gmail pushes modern browser technology to the limit, so initially we weren't able to make it available to those of you who use IE6. Because it was released way back in 2001, IE6 wasn't able to handle the complexity of the new code in a way that met our performance and stability goals. Over the last few months, we've been working with the IE engineers at Microsoft to address these issues: they released a critical update to their JavaScript implementation that fixed a performance problem with how the script engine allocates and frees memory. We also made small simplifications to the UI when it runs in IE6 to improve stability. For example, we removed the drop shadow from contact pop-ups and the rounded corners from chat moles, both of which tended to cause problems in IE6.
This week, we've started to roll out Gmail's new code base to IE6 users. If you use IE6 and have the latest IE6 updates from Microsoft installed (or the specific patch that's required), you'll start seeing the features listed above.
