6/22/2023 0 Comments Cannot open microsoft outlook 2016If anything it’s a lesson to be careful in how you do your coexistence with Office 365. If you’re way ahead of me here, you’ve already realised the issue is all because I have an on-premises Exchange deployment that *is* in hybrid mode with Office 365 – but the SMTP account in question belongs to a cloud-only user. We took the machete to my saved windows credentials (Start / Credential Manager / Windows Credentials) and delete anything that had the name of my SMTP account, or was ambiguous (which looked to be Teams-related).Īrmed with some comparison logs from Fiddler, my support rep was EVENTUALLY able to return with the fix: a new registry key!Ĭomputer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover.Is it maybe some rogue Group Policy? Move the machine and my user accounts to the default OUs/containers
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