How to Remove Duplicate Emails in Outlook

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Posted on by Williams Welsh

My Outlook inbox is overflowing with duplicate emails. Manual cleanup risks data loss. What’s the safest, most reliable way to remove duplicates automatically while keeping attachments and formatting intact? Suggestions welcome.

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Jihane_Lazrag 7 on at

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How to Remove Duplicate Emails in Outlook

You can use Power Automate for this:

“Manually trigger a flow” (for on-demand runs

Use the action “List messages” from the Outlook connector.

Configure filters if needed (e.g., Inbox only, last 30 days, unread messages, etc.).

Build duplicate detection logic

For each email:

Construct a unique key (From + Subject + Received Time (rounded) + Attachment names).

Check this key against your Dataverse table / SharePoint list (the “seen keys” log).

If the key already exists → Move the email to a “Possible Duplicates” folder. (Then you can check easily to delete)

If the key is new → Save it to the log and keep the email where it is.

The use of copilot here is just a custom agent to ask him the power automate described above if you prefer this than trigger the workflow manually.

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