How about a new profile? Noted at https://community.office365.com/en-us/f/172/t/166632
I managed to install Windows 10 after a long fight but now outlook is permanently stuck in offline mode I have repaired it but that didn't work it seems I can receive emails but not send them
when I click on the online/offline button nothing happens

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic