Meetings that are edited in Outlook is creating duplicate meetings in CRM

Question

In Outlook when you edit a meeting it actually deletes and creates a new one on the back end?

Answer 1

Hi Lex Minter

Just checking in — have you had a chance to review my message above? I’d love to hear from you.

Best regards

 

Answer 2

Dear Lex Minter

Thank you for reaching out to the Microsoft Q&A forum. I understand you are having problem with duplicate CRM meetings after editing an Outlook.com event in Outlook on the web. I am happy to assist you. Are you using Outlook with a personal Outlook.com account or a work Microsoft 365 account, and which CRM system is being used? 

Look forward to hearing from you! 

Answer 3

Outlook does not literally delete and recreate every meeting when it is edited, but certain scenarios can result in behavior that looks like a new meeting being created, which downstream systems (such as CRM integrations) may interpret as a new item instead of an update.

From the provided information:

• There was a known issue (EX800425) where updating or cancelling meetings in Outlook for Microsoft 365 could create local conflicts and duplicate calendar items on the organizer’s calendar. This was a service-side problem that caused multiple copies of the same meeting to exist, especially if the “Conflict Message” dialog was used and “Keep All” was selected.
• The fix for EX800425 has been deployed and prevents new conflicts, but it does not retroactively fix existing conflicted/duplicated meetings. Existing duplicates must be cleaned up (for example, by clearing offline items or using the CalCheck tool to identify and remove duplicate items).
• When duplicates exist, any sync or integration layer (such as a CRM that syncs from Exchange/Outlook) can treat each duplicate as a separate meeting, which appears as “new” meetings in the CRM when the organizer edits them.

So:

• Under normal, healthy conditions, editing a meeting in Outlook updates the existing item.
• If the mailbox has conflict/duplicate issues (such as those caused by EX800425), edits can appear as separate items or duplicates, and external systems may see them as new meetings.
• Cleaning up duplicates on the Outlook side (using the documented workarounds and CalCheck) is required so that downstream systems stop seeing “new” meetings when an existing one is edited.

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References:

• Outlook shows conflict errors when updating or cancelling meetings
• How to troubleshoot missing and duplicate appointments in Outlook
• Outlook users who are booking delegates that add a Room to a meeting invite may notice duplicate emails requesting responses