Outlook 2007 & Exchange | Input for Credentials popping up

One of our Exchange users reports that every so often an input box to enter in a username and password pops up while he is connected, or has been connected, to our Exchange server. He connects to the Exchange server via remote VPN to a PIX. He says if he closes Outlook and reopens it, everything is fine. When he gets the credential popup, he cannot send or receive email.
TercestisiAsked:
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TercestisiConnect With a Mentor Author Commented:
It had to do with them losing their VPN connection.
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MesthaCommented:
Without knowing what server is asking for the details, it is hard to know.
What version of Exchange are you using? It could be autodiscover that is causing the problem.

Simon.
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TercestisiAuthor Commented:
Supposedly Exchange 2003 running on SBS03 is asking for the credentials.
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