EdbMails Exchange migration tool is the best solution to perform incremental migration. You won't get duplicate items during consecutive migration on the same system.
You can migrate all the mail items from one Exchange server to another Exchange server or to Office 365 server without any duplication of data. You can test out this feature using demo version which allows you to migrate 30 items from each and every folders.
Visit :https://www.edbmails.com/pages/exchange-migration.html
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