SBS 2008 with Windows 7 desktops & Office 2010 continuously prompting for authentication

SBS Server 2008 with Windows 7 desktops and Office 2010. When the Outlook Client is launched it prompts for login credentials. Tried several means to correct situation but it keeps coming back. Does any one have any ideas? Inserting domain\user id doesn't solve it.
henrymoray2Asked:
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meko72Commented:
You should also check for cached credentials and delete all of them if you find any.

Or It could be a DNS issue I would try   IPCONFIG /FLUSHDNS
henrymoray2Author Commented:
This did not help resolve the problem <You should also check for cached credentials and delete all of them if you find any.

Or It could be a DNS issue I would try   IPCONFIG /FLUSHDNS>
Elmar KoschkaSenior System EngineerCommented:
Please install servicepack 3 and update rollup 6 for Exchange Server. That should resolve your Problem.

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diperspCommented:
What does the Outlook mail config look like?  Is it using RPC over HTTPS?  If so - what are the settings on that screen (Screen shot would be great.)
Elmar KoschkaSenior System EngineerCommented:
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