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Outlook O365 Gives Windows Security box

Client with O365 the Outlook started to prompt a Windows Security box asking for login and password. Entering the password fails and it would not work. Found this on the Internet.

Basically do the following:

  • Please go to this location in registry editor HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity

  • Delete EnableADALREG and EnableADAL keys

  • Restart the computer and then check the behavior of Outlook

  • If issue still persists, then go to the same location in registry editor HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity

  • Create a DWORD key EnableADAL and set the value 1

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