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To migrate mailboxes to Exchange Online, You can use Cutover Exchange Migration or IMAP e-mail migration.
If you use a Cutover Exchange Migration, you can refer to this link:
If you use a IMAP e-mail migration, You can refer to this link:
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How are things going on your side? If you need further assistance on this issue, please feel free to contact us.
Thanks Jerry for the quick reply.
Well before starting in production environment, I need to prepare it in the test lab.
Thanks for your update, if you need futher assistance when perparing test lab, please feel free to let us know.
An IMAP migration will only migrate emails (email is all that the IMAP protocol "understands"). So most likely you should use a cutover Exchange migration. This requires a valid SSL certificate, Outlook anywhere, the Microsoft DirSync tool, etc.
A lightweight alternative is to use a third party tool such as MigrationWiz to streamline the process. To prepare your Exchange 2010 environment, refer to: migrationwiz.zendesk.com/.../20568262-how-do-i-prepare-my-exchange-2010-server-as-the-source-server.