Open "Exchange Management Shell." This is an administrative tool that is typically installed on a PC server computer. You will find this tool under the "Microsoft Exchange Server" folder on your "Start" menu.
Type "get-offlineaddressbook | update-offlineaddressbook" and press "Enter."
Let Exchange Management Shell "rebuild" your Global Address List. Once the process is complete, check your Address Book. You should be able to see the changes or updates you made on the Global Address List