Hi, exactly the same issue that I am experiencing, did some work on a plane moving/deleting emails offline. The changes that I made are showing up in MacMail but not on the Exchange server. The account is working fine, can send and receive emails without trouble but all of the changes that I made before are not syncing. Have tried restarting mail, rebooting computer, deleting and reinstalling the account. Using Lion, Mail 5.3, MacBook Pro. OS 10.7.5. Thanks!