Receiving’ reported error (0x800CCC90)

I have an exchange server that some users log into as a pop3 mail server. One of my users gets the following message:

Receiving’ reported error (0x800CCC90): ‘your incoming (POP3) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: =20’

It was working fine until today. Any ideas? Thank you!
CubbybulinAsked:
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SembeeConnect With a Mentor Commented:
Probably a corrupt message. Get the user to login to OWA and delete the message that is blocking.

Even better idea - ditch POP3. If you are on Exchange 2003/Windows 2003 with Outlook 2003/Windows XP on the client then you can probably use RPC over HTTPS. POP3 is an awful protocol that doesn't let you use all of the features of Exchange.

Simon.
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CubbybulinAuthor Commented:
Oh, and every time she connects, it just keeps downloading the last 30 or so undread emails over and over again.
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CubbybulinAuthor Commented:
Oh and she is the only one receiving the error, uses outlook 2003, and when i added her account on my computer, i got the same error.
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CubbybulinAuthor Commented:
thanks, I already fixed it, indeed, it was a corrupt message.
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GretchenKuhnCommented:
The solution "probably a corrupt message" was the clue I needed to figure out what was keeping my incoming email messages from downloading into Outlook and generating the error.  I figured it was one of the messages from the time it quit working.  II discovered which one it was by moving all the emails out of my inbox on the email server into a folder I created in the email utility.  One email (from my brother no less) would not move and would not delete.  I used the "purge" command which did remove it and it fixed it.  
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