Refer to the Note under the End-user education and communications from Migrator for Notes to Exchange 4.16.3 - Pre-Migration Planning Guide at https://support.quest.com/technical-documents/migrator-for-notes-to-exchange/4.16.3/pre-migration-planning-guide/18#TOPIC-1941900.
The Note :
End users should be advised to check and resolve (accept or decline) any pending meeting invitations, changes to existing meetings, and other calendar items—i.e., items that have been received but not yet accepted or declined. If these sorts of items are migrated before they are resolved, they may not generate the desired results in the migrated content.
