How All Items and Items to Migrate are calculated on On Demand Migration console?
All Items - Value returned by Get-MailboxStatistics Items to Migrate - ODME calculates according to the migration settings (filters by date, by content type, by particular folders) at the estimation step.
Note: The way ODM migration engine sorts the source messages is first based on Received Date and if the Received Date is not available, the migration engine sorts the message based on Created Date.
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