Solution: web applications using DHTML Editing Control do not work in Windows Vista
Last year, we made a post to the IE team blog about the removal of the DHTML Editing Control from the Windows Vista. The removal of the control affects three types of applications: A Windows application that relied on the DHTML Editing Control would not work in Windows Vista. Available solution at: http://www.microsoft.com/downloads/details.aspx?familyid=b769a4b8-48ed-41a1-8095-5a086d1937cb&displaylang=en Outlook Web Access does not work in Vista due to removal of DHTML Editing Control. Available solution at: http://support.microsoft.com/kb/911829 . Web applications that rely on the DHTML Editing Control are affected by the removal of this control in Vista. To date for web applications affected, we recommended rewriting portions of the application
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Read the complete post at http://blogs.msdn.com/webdevtools/archive/2008/04/03/solution-web-applications-using-dhtml-editing-control-do-not-work-in-windows-vista.aspx