I recently installed the latest Office Update (14.4.5).  From then on, I have the following problem:

Messages which are put into a Category by a rule have the Category set when the message arrives in my Inbox

Shortly (one or two seconds later), the Category on the message is unset and the message is not in any category.  Initially I thought this was connected with a "downloading attachments" message on Outlook, but this is not the case as I've now seen it on messages with no attachments.

This is repeatable and very annoying!  I have tried recreating the rules but to no avail.

Does anyone have any suggestions?  Is this a known bug?