Outlook for Mac adds new authentication flow for Google IMAP in Insider Fast

With the release of the Insider Fast version 16.11 (18013000), Outlook for Mac now supports OAuth for authentication for Google Accounts configured via IMAP. This feature will start rolling out slowly to our Insider Fast users.


If you have a Google account added via IMAP, you'll be asked to authenticate using the new workflow. The two key benefits are:

  • No longer need to set “Allow less secure apps” for account
  • No longer need app password when 2-Step Verification is enabled


Previous authentication flow:


Basic authentication dialogBasic authentication dialog


New authentication flow:


Sign in to Google via browserSign in to Google via browser


Clicking on "Sign in to Google" (above) will launch the web browser to complete authentication.


Browser sign inBrowser sign in


We would love to hear from you, so please provide feedback and report bugs, via Help > Contact Support. If you would like to see enhancements and additions to this feature, (or Outlook for Mac as a whole), please vote for the idea on our UserVoice site (Help > Suggest a Feature)


Occasional Visitor

This is not working for me.  I see the sign-in box but when I choose an email address (e.g. xxxx@gmail.com)and put in the password, I persistently get a pop-up box which says that I have signed in to an email account which is not "xxxx@gmail.com".  Is there any way I can opt out of this feature?  I need to get on with work - it was all working yesterday and now I cannot receive and send via Outlook.


Hi Jenny, please contact using Help > Contact Support so we can look into it.




Occasional Visitor

Please help -- my Outlook for Mac stopped working this afternoon with gmail for no apparent reason.   It asks constantly for my password and when I enter it I receive the error that "Mail Cannot be Received at this Time" with the details


The server for account "rrmax1@gmail.com" returned the error "[AUTHENTICATIONFAILED] Invalid credentials (Failure)." Your username/password or security settings may be incorrect. Would you like to try re-entering your password?


I have re-entered my password with no luck.   What happened?   Gmail still works with outlook on my iPad and iPhone.   Help!!! 





Hi Ronald, please reach out to our team via Help menu > Contact Support within Outlook.