If you make changes to a mailbox on an Exchange 2010 server, sometimes it can take a few minutes for the changes to be visible to the client. Sometimes those changes can be reflected incorrectly in the client for a short while. For example, recently I gave a customer a temporary upgrade in her mailbox storage quota to 3.5 GB. After a week, I saw that her mailbox was back under the normal limit, so I set it back to the database defaults, which was 2 GB. Outlook then showed the client’s mailbox to have 115 MB free of 350 MB. I have no idea where those numbers came from. After restarting Outlook, the free space and quota both displayed correctly. If the changes don’t take effect within 30 minutes, try restarting Outlook, and be sure to check the task manager to make sure OUTLOOK.EXE has actually closed before you restart it.