security certificate revoked - outlook.office365.com

John Rovel Kalaw 6 Reputation points
2022-07-27T04:28:49.213+00:00

Hi

The pictures below started popping up on our PCs. and the PC was using not part of any domain. I tried to follow the link below but the IE was inaccessible. https://answers.microsoft.com/en-us/outlook_com/forum/all/outlookoffice365com-security-certificate-has-been/743bdb2b-06ce-4206-923e-bdb7041528bd

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Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
4,899 questions
Windows Server Security
Windows Server Security
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
1,725 questions

49 answers

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  1. Daniel 1 Reputation point
    2022-09-25T18:05:34.72+00:00

    I also have recently started encountering this error message. I use Microsoft 365 through Outlook on my Windows computer, with the latest versions of Windows 10 and Office 365. The Exchange server is hosted by Microsoft.

    If I click "OK" when the message pops up I can continue as before.

    It would be good to understand what is causing this error message...

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  2. Richard Tilley 1 Reputation point
    2022-09-26T16:37:59.21+00:00

    Apple Mail app on
    Mac also gets this warning.

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  3. edgar 1 Reputation point
    2022-10-26T18:45:56.38+00:00

    Hi @John Rovel Kalaw

    What MS Office desktop app do you use? The below link is for version 2013 and I hope this will help to resolve your issue.

    Topic: Outlook 2013 displays a prompt that lets you connect to an Exchange server if a certificate issue occurs (microsoft.com)

    https://support.microsoft.com/en-us/topic/outlook-2013-displays-a-prompt-that-lets-you-connect-to-an-exchange-server-if-a-certificate-issue-occurs-14a64c85-b24e-b930-0ff8-ddb55fd4288e

    Thanks,
    Edgar

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  4. Neddy 16 Reputation points
    2022-10-27T18:07:08.72+00:00

    Same thing here. Only about 10 percent of the users are seeing this error. Approx 60 users. This has been going for about 6 months.

    All are AD systems.
    AZURE AD sync is active and syncing properly
    Mix of Windows 10 and Windows 11 devices. All users have Office 2019.
    Currently only getting reports from users on Windows 10 but that could be a coincidence.

    Anyone getting this on Windows 11?

    I usually tell the user to reboot and report back if it happens again. I never hear back. It's pretty random. I think it happens if the user has a brief connection issue such as a couple dropped packets. Hoping it's something easy to fix such as upgrading from Windows 10 to Windows 11.

  5. Aragon, Neil 1 Reputation point
    2022-10-28T13:38:34.167+00:00

    I just want to also chime in that we're getting more calls from our users about this same issue. Outlook clients and iOS Mail users are getting prompted with the security pop-up.
    I've just opened a ticket with Microsoft yesterday about this issue. They've just asked some initial discovery questions and haven't gotten back to me yet.

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