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A migration history contains information about the migration profile as well as a list of historical migration reports for the profile (for more information about viewing historical migration reports, see View a migration report).
On the top navigation bar, click Operations.
On the Operations page, in the Global Configuration section, click Content Management Server Migration.
On the Manage Microsoft Content Management Server Migration Profiles page, in the list of profiles, click View History on the menu of the migration profile for which you want to view the migration history.