I'm trying to empty my Deleted Items folder but I receive a message telling me I need to wait for the sync to finish. It's been over a week, how long does it take to sync these changes?
When you delete a lot of folders from a mailbox, it's not all that uncommon to receive an error message when you try to empty the Deleted Items folder:
Outlook is synchronizing local changes made to items in this folder. You cannot remove this folder until the synchronization with the server is complete.
Would you believe me if I said it sometimes takes between forever and never? When Outlook seems to get hung on syncing the changes, log into OWA and empty the Deleted Items folder there. If you have a large number of folders in the Deleted Items folder or you didn't allow Outlook a reasonable amount of time to sync changes, you many need to empty the Deleted items from OWA two or three times.