The transport hub and mailboxes runs on the same server. Edge is on its own. I need to restart the Transport and mail server. What happens to incoming mail when it is restarting? Al

External mail should be queued on the edge, internal mail wont get sent as the mailboxes wont be available so Outlook wont be avaliable unless using cache mode, and email should sit in your Outbox until Exch is up again.Sukh