http://technet.microsoft.com/en-us/library/aa996088(EXCHG.65).aspx
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Click Start, click Run, type outlook /rpcdiag, and then click OK.
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Type your credentials in the User name box and in the Password box, and then click OK.
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If HTTPS appears in the Conn column in the Exchange Server Connection Status window, a service is connected by using RPC over HTTP.