Delta migration feature
While performing data migration, there is a high chance that before the transfer of data is completed, the source server mailboxes will receive some new emails, new entries in calendars, etc. If you use CodeTwo Exchange Migration to move data between servers, you can easily run a delta migration to transfer all missing items from the already migrated mailboxes. No worries, you will get no duplicates on the target server.
CodeTwo Exchange Migration has a Rescan feature, which is designed to safely re-run migration for already migrated mailboxes. The program’s intelligent scan mechanism recognizes already migrated items, so there is no risk of getting duplicates – only the new content will be migrated to the target server.
Once the delta migration is completed, you can confidently switch the mail flow to the new server and be sure that no items were unmigrated.