Hi @Anser Leon ,
Does anyone know if this is Office 365 rejecting the OS ? Are there any KB or alerts put out by Microsoft advising the compatibility issues ?
I tried searching a lot but didn't see any official article explicitily stating the supportability of Office 365 services with Windows 7. According to this document, currently it's supported for Office 2016 to connect to Office 365 services include Exchange Online. And this article mentions that "Non-subscription versions of Office used by organizations, such as Office Professional Plus 2016 or Office Standard 2013, will continue to be supported(on Windows 7) based on the Fixed Lifecycle Policy. ", so my understanding is that it's still supported to connect to Exchange online account on Outlook 2016 running on Win7.
However, two weeks ago or so I started to experience an issue on the remaining Windows 7 computers. Outlook 2016 would no longer connect to Office 365.
Considering that it's a recently occurred issue, may I know if any change was made on the Windows 7 machines right before this issue started?
Besides, based on my experience, please try testing on one of the affected maichine by adding the registry key below and see if it can help:
Important: Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
Registry key: HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\EnableADAL
Type: REG_DWORD
Value: 0
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