Constant Credential Prompts

Hi all,
I've got a Windows 7 Pro SP1 64Bit machine, connected to a SBS2008 domain, which is exhibiting a strange issue.
In the last month or so, one user has complained about being prompted for credentials when opening documents from a mapped drive. Even if he enters the correct credentials, it keeps on prompting, almost like the incorrect credentials have been entered.
The strange thing is, this only happens when Outlook 2010 is open. With Outlook closed, the user can open the documents without any issues, and no credential prompts.
The user can log in to the machine, browse the shares and open documents, providing Outlook is not open.
I've recreated his Windows profile, and the issue appeared to have gone away, but now, two weeks later the issues has reoccurred.
I've tried opening a Word document, and am being prompted for credentials. If I cancel the request, I get a pop-up error saying - "The Internet address 'http://servername/share/docname' is not valid."
As mentioned, I've recreated the user profile, Outlook profile, opened Outlook in safe mode, and disabled all the add-ins, but still have this issue when Outlook is open.
Any help would be greatly appreciated.
CheersJéan

It sounds like the user is changing passwords after having had Windows store them for him. Windows will keep trying to connect with the old password, then fail and prompt for the new one. Try clearing out the stored passwords:
In Control Panel click Credential Manager, find the appropriate credentials (Outlook, Windows, possibly others), click the dropdown arrow and then click Remove from Vault.
Good luck!

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