On-Prem Exchange to O365 – Outlook Issue

Hi all

Last week we had a migration from On-Prem Exchange to O365. We had some issues connecting to O365 mail accounts (timeout, Autodiscover issues, etc.). So be sure to check following settings:

Possible solutions

  • Check possible hosts – file entries (C:\Windows\System32\Drivers\etc)
  • Clear Microsoft Windows Credentials Manager for possible Outlook – entries
  • Delete Autodiscover registry key (HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover)
    Do it for all possible Versions 15 / 16 / etc.

We spend hours on this issues. Maybe it helps someone out there.

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