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View Google's detailed documentation on Labels. Moving mail from/into sub-folders during the migration process could result in duplicated messages if the migration process transfers the originating folder prior to the message move and transfers the destination folder after the message move. The message will remain in its prior folder location on Gmail.
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If you move a message on the Central Mail system after it is copied to Gmail, that action will not be replicated in Gmail.
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What actions are not synchronized once the migration starts? If a message is identified as malicious, the email message and corresponding attachment(s) will not be migrated. During migration, each message undergoes a security scan.
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