Exchange 2010 RPC over HTTP Connectivity

In some situations 2003 users connecting to an mailbox using RPC over HTTP receive the following error message:

“Server Unavailable”

Although this is an Outlook 2003 specific client issue, the issue is not specific for organizations. It could also appear in organizations running or 2007.

The problem occurs if the RPC proxy server extensions do no load correctly. You can find more details and a description of how the issue can be remediated in the following KB article:

Special Thanks to Henrik Walther

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