I have several Outlook PST files created from different computers and old mailbox backups. Some of them contain overlapping emails, contacts, calendars, and tasks, so I am trying to find the safest way to clean the duplicate data without losing important mailbox items.

What is the recommended method to remove duplicate emails in Outlook when the duplicates exist across multiple PST files rather than inside a single mailbox?

I initially considered opening each PST in Outlook and manually deleting repeated messages. However, this seems impractical because some PST files contain thousands of emails. There is also a risk of deleting the wrong message when two emails have similar subjects but different timestamps, senders, or attachments.

I would prefer a method that can compare mailbox items using specific criteria and identify genuine duplicates before removing them. It would also be useful if the process could preserve folder organization and allow the original PST files to remain untouched.

I came across the concept of an SysInfo Outlook duplicate remover that can scan more than one PST file. This seems more suitable for situations where duplicate data has accumulated through mailbox backups, imports, archiving, or repeated Outlook migrations.

Another important requirement is the ability to remove duplicate items from Outlook selectively. For example, I may only want to process Mail and Contacts while leaving Calendar and Tasks unchanged. Date filters would also be helpful because some duplicate items may have been generated during a particular migration period.

For anyone dealing with multiple PST files, I think the safer workflow would be:

1. Create backup copies of all original PST files.
2. Add the required PST files to the deduplication process.
3. Select the folders or mailbox categories that need cleaning.
4. Apply suitable duplicate comparison criteria.
5. Preview the identified items before removing them.
6. Save the cleaned data to a separate PST.
7. Open the resultant PST in Outlook and verify the folders and attachments.

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