Outlook 2011 for Mac issuing folder delete commands on shared mailboxes

Outlook 2011 for Mac in an Exchange 2010 SP2 Environment.

I have a group of 6 or 7 users who access their Exchange mailbox via Outlook 2011 for Mac using the "Exchange" connection. They are all using the most current version 14.3.9, though this had occurred with prior versions as well.

These users also connect to a group of shared Exchange resource mailboxes, to which they have been granted full mailbox access and send as permissions.

These mailboxes are added to their default identity via "File-->open-->other user's folder". each user connects to these mailboxes the same way.

These shared mailboxes are relatively small, less than 100mb and less than a few hundred mail items each.

On two separate occasions now, all sub folders of the inbox of several of these shared mailboxes are being soft-deleted by Outlook for Mac. The User issuing the delete command varies, but they are always the Outlook for Mac users listed above.

I have confirmed through reviewing of Time stamps via Exchange mailbox auditing that these users are NOT manually issuing the folder delete. My best guess is that it's occurring as the result of some sort of synchronization issue with Outlook for Mac and the shared mailbox.

I can't keep recreating identities for these users (Which didn't appear top resolve the problem anyway), and I can't have these folder deletes continue to occur, as my only course of action is a data restore from backup.

Here is an example of an audit log entry from one of the resource mailboxes. I've removed the real name of the user in the "performed by:" column, but other than that, it's a real entry.

Can anyone give me insight as to why this is happening and how I can resolve it?

Thanks,

Christiaan