Exchange Pop Up

I have a customer that is randomly getting a pop up box for credentials in Outlook. When you enter the credentials it doesn't do anything. However, you can close and reopen Outlook and then you can connect to Exchange. Anybody seen this before?
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That pops up infrequently here. I usually just delete the user profile on the computer and have them log back in with a new profile and it is fixed.

I do not know the cause or a better solution, only what works for me.
aandoAuthor Commented:
This is happening randomly on a 40+ user network. Surely there is a better way than recreating all of those profiles. I'll keep your solution in mind though if no one else chimes in. Thanks!
Make sure you are running the latest version of exchange, also see if there are any patches/updates.

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aandoAuthor Commented:
Crazy how updates fix problems that come out of nowhere. I initially thought about updating but since it was during the day obviously I couldn't. Thanks for the input, updates appear to have fixed the problem.
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