Hey! I have set up Office 365 Server integration ( I have a local Exchange Server 2016) Further I have added all Mailboxes of my company (About 200) to "Sync User". Some of the contacts are synced to 3CX, some are not. Can someone answer following questions: 1) Is there a limit for the amount of mailboxes? 2) Is there a log somewhere where I can see which mailboxes did not work? Perhaps with error messages? Your ideas are very appreciated. Thanx!