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My question is quite similar to the one posed some time ago: Is it possible to check Microsoft Exchange mail from Gmail? What’s new is that Microsoft Exchange does not support POP3 authentication anymore. More recently, someone seems to have had my same problem and is still waiting for an answer: https://www.reddit.com/r/GMail/comments/nej1yg/can_i_route_my_outlook_email_through_my_gmail/

Shortly, my institution mail was recently migrated to Microsoft Exchange Server and I would like to check/import such emails into my Gmail account. Following the standard procedure to import email into Gmail
Settings > All Settings > Accounts and Import > Check mail from other accounts: Add another email address
  I am offered only the possibility to import email from another (non Gmail) POP3 account and not OAUTH2. If I blindly proceed with the POP3 option and set

  • POP Server: outlook.office365.com 
  • Port: 993

The import obviously fails. Does anybody know a way to circumvent this problem or if there is another way to configure OAUTH2 method in Gmail? I tried setting up a forward rule, but it does not provide the whole functionality I would need; moreover, this solution is discouraged by our institution. Thank you in advance.

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  • As of July 28, 2022 we are also experiencing this problem. It seems Microsoft has disabled Basic Authentication for POP3 / IMAP. We have yet to find a way to enable it again. Clients like GMail will not be able to authenticate. Commented Jul 28, 2022 at 17:17

1 Answer 1

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Can be temporarily restored

It can be re-enabled by an Exchange Admin up to and including December 2022 using MS Exchange's self-service diagnostic.


Basic Authentication Deprecation Exchange

Microsoft has been planning for some time to disable basic authentication. The original target was the second half of 2021.

In February 2021 Microsoft indicated that the pandemic and "the effect it has on priorities" moved it to postpone disabling Basic Auth for protocols in active use while extending the scope of the program to include Exchange Web Services (EWS), Exchange ActiveSync (EAS), POP, IMAP, Remote PowerShell, MAPI, RPC, SMTP AUTH and OAB.


High Level View

Source: Basic Authentication Deprecation in Exchange Online [Sept 2022 Update]

Initial Shutdown

  • October 1, 2022 Microsoft will start to randomly select tenants and disable basic authentication access for MAPI, RPC, OAB, EWS, POP, IMAP, EAS and Remote PowerShell.

Temporary Re-Enablement (Grace Period)

  • after October 1, customers will be able to re-enable it for any protocols they need, once per protocol[footnote 1] via the self-service diagnostic.

Permanent Shutdown

  • Re-enabled protocols will work until December 2022. In January 2023, these protocols will be permanently disabled.

1 The peculiar use of the words "once per protocol" in the Release suggests to me if, during the grace period, you disable a protocol after re-enabling it, you will not be able to re-enable it and it will remain disabled. i.e. Cannot toggle on then off then on

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