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Microsoft 365 - Handling Duplicate Events

If you are experiencing an issue where events are being duplicated in your calendar (mainly ones that were imported via class schedule process), this document will guide you through steps to help resolve the problem.

Recently a case was open with Microsoft regarding a reoccurring issue where customers' events would be duplicated a numerous amount of times in their calendar, up to thousands. Microsoft believes it is another client causing the issue but the problem can not be easily reproduced in order to find a solution to the recreating events. As of now, there are currently two solutions we can provide to help resolve the problem.

Contact Us

If you do not have access to any Outlook clients, you can contact us to delete the duplicate events for you. To contact us, please refer to the following document:

Solution Through an Outlook Desktop Client

  1. Remove your account from all devices other than the Outlook client you will be working from. Below are other documents regarding how to remove your account from different clients and mobile devices. Review the documents and make sure you have removed your account from ALL that may apply to you.

  2. Next, you will need to make sure your Outlook client is properly configured. If your Outlook client is not properly configured please follow the steps provided in one of the following documents based on what version of Outlook you are configuring.

Use the steps below to delete the duplicate events from your calendar.




Keywords:
microsoft office365 o365 m365 microsoft 365 issue problem duplicate events handling solution calendar schedule help replicated outlook 2016 2019 OWA outlook on the web mac windows osx 
Doc ID:
47409
Owned by:
O365 S. in Microsoft 365
Created:
2015-02-19
Updated:
2025-06-05
Sites:
DoIT Help Desk, Microsoft 365