You see that the "Items to Migrate" value is larger than the "All Items" under the Mailbox project.
When calculating All Items is the value returned by Get-MailboxStatistics Items to Migrate
During Accounts discovery we collect some mailbox statistics. However, during a mailbox migration, we do another assessment of the items that need to be migrated and you may encounter two scenarios:
1) Estimated vs Processed - The estimation is made by requesting the number from the folder level at some moment of time, but the final processed count is the final number summarized after the migration is done, after we went thru all the folders and touched all the messages. The processed count is more accurate compared to estimated
2) Processed vs Migrated - some items can be migrated previously, so they do count as processed but do not count as migrated
"All items" doesn't take into account the items within the Recoverable folder.
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