Exchange 2003 - OWA & Windows Vista
If you are currently using Exchange 2003 SP2 and want to access OWA from recent Vista Beta releases, then you'll need to install this patch on your Exchange Server. In short, the Dynamic HTML Editing ActiveX control is being removed from the Internet Explorer browser (IE7 in Vista). 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.
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