At the bottom of the Search Folder Criteria dialog set the time selection to: Modified Today.

In the New Search Folder dialog, scroll to the bottom and select: Create a custom Search Folder.

Instead, you could create a Search Folder which searches your entire mailbox for messages that were modified today. The above method would then be less effective. If you are using rules to sort your emails, it could be that duplicates are now scattered across various folders. You can use the instructions above to resort your view by the Received date again. Now just press the Delete button on your keyboard to delete them. Hold SHIFT when selecting this message to automatically select all the messages in between. To quickly delete all the duplicates at once, click on the first duplicate message to select it and then scroll down to the final duplicate message.

To see the Modified field, select the Date/Time fields list first.

If you get a warning that the Modified field has not been added to your view yet, you can select “No”.

Press OK until all open dialogs are closed.

Select the Modified field and place it above the Received field.

At the bottom, set the “Select available columns from:” to: Date/Time fields.

View-> Current View-> View Settings…-> Sort… So if you were to sort your view by the Modified field, most (if not all) of your duplicates will be nicely grouped together. Sorting mail by the Modified dateĪs all the mails that got redownloaded are created as new items, they’ll all have their modified date set at roughly the same time. There can be various reasons for this to happen but assuming that you’ve already sorted out the issue, let’s focus on cleaning up these duplicate messages. I now have a huge list of duplicate messages. I’m not sure what happened, but suddenly all my emails that were still on the mail server got downloaded again.

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