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Important
This feature of Exchange Server 2013 isn’t fully compatible with Office 365 operated by 21Vianet in China and some feature limitations may apply. For more information, see Learn about Office 365 operated by 21Vianet.
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Resources that apply to Exchange Server 2016:
Mailbox moves in Exchange 2013
Resources that apply to Exchange Online:
Migrate mailboxes to Exchange Online with a staged migration
Migrate all mailboxes to Exchange Online with a cutover migration
Migrate Email from an IMAP Server to Exchange Online Mailboxes
Resources that apply to Exchange Server 2016 hybrid deployments:
Move mailboxes between on-premises and Exchange Online organizations in 2013 hybrid deployments