In the upcoming Microsoft Windows Vista Beta 2 release, the Dynamic HTML Editing ActiveX control is being removed from the Internet Explorer browser. As a result, there is functionality missing that Microsoft Exchange Outlook Web Access relies on. This update replaces that deprecated functionality on the Microsoft Exchange servers so that Microsoft Exchange Outlook Web Access continues to function smoothly.
The DHTML ActiveX Control has been around since Internet Explorer 4 came out and had numerous security and other issues. A few patches has been issued and the re-issued over the years, but I guess Microsoft finally gave up on using the ActiveX wrapper for this and removed the component altogether from Windows Vista and other future projects. Expect also some websites to lose functionality.
Downoad the update patch here:
For more information about the Dynamic HTML Editing ActiveX: http://www.snook.ca/archives/000108.php