Things to consider

Setting up an email cutover migration to Microsoft 365 or Office 365 requires careful planning. Before you begin, here are a few things to consider:

You can move your entire email organization to Microsoft 365 or Office 365 over a few days and manage user accounts in Microsoft 365 or Office 365.

A maximum of 2,000 mailboxes can be migrated to Microsoft 365 or Office 365 by using a cutover Exchange Migration. However, it is recommended that you only migrate 150 mailboxes.

The primary domain name used for your on-premises Exchange organization must be an accepted as a domain owned by you in your Microsoft 365 or Office 365 organization.

After the migration is complete, each user who has an on-premises Exchange mailbox also will be a new user in Microsoft 365 or Office 365. But you'll still have to assign licenses to users whose mailboxes are migrated.

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