Does anyone know what causes the above error and most importantly how to overcome this?

I cannot send or recieve emails on my Blackberry. When sending i get a cross and then a message stating "Unlisted Message Error".

The device is connected to a BlackBerry WebClient

Any ideas???

Think i sorted this out ... the mailbox reached its limit, once deleted it was ok ... hmmmm!

Another 1 Bytes the Dust

Had this problem after exchnage client Tasks folder was corrupted. Deleted user from BES, unloaded desktop software, offlined emails to pst file then deleted entire email and AD account. Re-added user to AD, mail enabled account, added user to BES then updated over wireless.

This was after esculating to service provider and RIM with no joy from their support teams!