It's definitely a synchronisation problem when opening the program. I get a send/ receive at the bottom on opening which disappears after a second or two and no mail, no error message. I then do my 'tweak' and the synchronisation bar at the bottom comes on hatchured and the mail starts to arrive and there're no further problems as long as Outlook 365 remains open, incoming mail warnings pop up etc.
I'm using Window 8.1 and BT Infinity with a wired connection to my computer. Everything else is fine, Explorer I-tunes etc open without any problem. Testing Outlook on the repair page generates a test message which doesn't show unless 'tweaked' on first opening. IMAP setting checked and set up properly.
I read somewhere a while ago that Outlook can act up if left continually on line.
Thank you your help with this problem
MP