Lion, Exchange 2010. Mail loses all emails in an exchange account
I am running Lion on an new 2.0 GHz i7.
We are using Exchange 2010 SP1 and I have 2 exchange accounts setup in Mail. Every two weeks or so Iose all the emails in one of the accounts. After a few minutes Mail seems to realise, and startes resyncing all my emails. The mailbox is 2GB in size so this takes about an hour time during which Ihave no emails.
Fortunatly so far this has only happened while I'm working in the office but if it happened while Iwas work off-site it could take a lot longer to sync
The other exchange account has not had this problem.
iCal-OTHER, Mac OS X (10.6.7)