We are in the process of moving to Office 365. This of course includes Exchange as your mail server and it is hosted by Microsoft all in the cloud. Up untill now the transfer of pst to ost has gone smoothly. In this particular case however the user has a large pst (18 GB) on the exchange server it says it is only 11 GB and I suspect that it has stopped syncing actually nothing has synced for about 18 hours now. Is there a way to force Outlook to start the sync again. We are using office 2007 in this case and i assume MS is using the latest version of exchange.