When migrating the Recoverable Items folder structure, you may notice a discrepancy in the number of items in source mailbox folders vs. the target mailbox folders after migration.
Or you may notice a a discrepancy in the number of items reported by the ODM tool in the source tenant /DiscoveryHolds folder compared to the source item count that MS Exchange shows.
On Demand Migration (ODM) and On Demand Migration for Email (ODME) only estimate and migrate the following item types when migrating items from the Recoverable Items folder:
"IPM.Note", "IPM.Document", "REPORT", "IPM.Schedule.Meeting", "IPM.Post", "IPM.Recall", "IPM.Sharing", "IPM.SkypeTeams.Message", "IPM.Appointment", "IPM.Task", "IPM.StickyNote", "IPM.Contact", "IPM.DistList"
We have logged Enhancement request ODMEM-I-91:"include log entry to help users understand what was/was not excluded from items to be migrated, with item counts of each item type." to be evaluated by our product team for possible inclusion in a future release of the product,