Entourage Error Message

[Christopher Holley]

Once again there is nothing to help me out on the support pages of
Microsoft. I have a MAC with OS X, with all the latest patches, and Office
X with all the latest patches.
I use Entourage to connect to an exchange server using IMAP. All of a
sudden when the user sends and receives he receives an error of:

unrecognized internal error: 0x50b.
Error: 1025

Any Idea's?
Christopher Holley