Outlook automatic canceling and sending meeting invitations

Wötzel, Michael 1 Reputation point

Since a short time we see a strange behavior on some Outlook clients.
A scheduled meeting is getting cancled and rescheduled every 15 minutes. The email notification is sent to external and internal recipients again and again. This happens even when no one is working.
We are running Outlook Version 2201 14827.20220.

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.
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  1. Faery Fu-MSFT 14,236 Reputation points Microsoft Vendor

    Hi @Wötzel, Michael ,

    Welcome to out forum!

    In order to beeter understand your issue, please provide some detailed information:

    1. How are meeting request sent(from Outlook or other calendar tools)? Is there anything special about this meeting(such as it's a recurring meeting)?
      And if re-creating a normal meeting in Outlook, could this issue be reproduced?
      1. Who is the organizer of the meeting? did the organizer of meeting is the shared mailbox?
        If you are using the shared mailbox, every user that has appropriate permissions could create and cancel the meeting in the shared mailbox calendar, in order to avoid the influence of other users, it's suggested to temporarily delete other users' peimission in this shared mailbox and only retain the permission of one user to test if the issue has any difference.
      2. If the issue still exists, in order to avoid the interference of add-ins, it's suggested to run your Outlook in safe mode and recreate the meeting to check(windows+R>type "Outlook.exe /safe">enter).

    If your issue has any update, please feel free to post back, and I would continue to research it with you.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 
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