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Microsoft Office 365: Exchange Online Implementation and Migration by Loryan Strant, David Greve

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The migration process — in a nutshell

The steps involved in the actual migration process will differ, depending on the option chosen.

Effectively they will follow the same basic pattern:

  1. Creating users' accounts
  2. Activating Exchange Online mailboxes
  3. Migrating mailbox content

Generally the Mail eXchange (MX) record is cut over after the completion of a successful mailbox migration however some administrators prefer to do this beforehand to ensure that no new mail items are left behind.

However, the key to a successful migration is not the actual mailbox content migration itself, it is the planning and preparation.

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