Exchange 2003 OWA does not open from Internet Explorer on Windows Vista / Windows 7
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To open Exchange 2003 OWA from Internet Explorer on Windows Vista and Windows 7, you only need to install a patch.
Download KB911829 from the Microsoft site and install it on your Exchange 2003 Server (SP2) where the issue occurs.
Service Pack 2 must be installed on the Exchange 2003 Server.
For convenience, here is the direct link:
http://download.microsoft.com/download/3/7/e/37eb12db-3104-4f3c-adca-1d23801e8453/Exchange2003-KB911829-v3-x86-ENU.exe
