Outlook Mac 2011 not updating location of messages

I'm running the following:

Outlook 2011 client on a Mac

Outlook 2010 client on a PC

Both clients sync to the same Exchange account (v. 2010)

On the PC everything works fine.

If I delete a message on the PC, it deletes from the Mac.

If I move a message on the PC, it moves on the Mac.

I can send email and receive email, no problem on the Mac and the PC.

But when I move or delete a message on the Mac, it does NOT move or delete on the PC.

This behavior seems to have started after recent Exchange Server upgrade to v. 2010.

Any insight would be appreciated.

- Sean

Question about Outlook Express