We are happy to announce that this new "delta sync" feature is now available to all customers who start their migration with Migrator for Notes to Exchange 18.104.22.1683 or later. This new feature is implemented with the following parameter:
Tells the Data Migration Wizard which of two methods to use, to avoid creating duplicate items in Exchange when
an item that has already been migrated to Exchange is queued to migrate again.
... tells the program that if the source item in Notes was modified after a previous migration, delete the Exchange copy of the item and then re-migrate it from Notes. If the source item in Notes has not been modified, leave the previously migrated copy in Exchange.