Exchange 2007 Prompts outlook for a password after MS U
Exchange 2007 Prompting for Password

It seems Microsoft has done it again with their security Updates. If you are running exchange 2007 on an SBS 2008 server and your internal outlook clients are being prompted for a password check your Authentication settings in IIS, specifically for Autodiscover, RPC, EWS, and OAB.

That seems to be the fix I have found recently, but if not there could be several reasons for the prompting. A great forum on this issue is located here.

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