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Office 365 – Migration approach

Exchange Online coexistence options Not all companies are ready to dive right into a hosted environment. Depending on your comfort level, you can run a hybrid/coexistence environment. And there are various levels to choose from in this option: simple coexistence or rich coexistence.

  • A simple coexistence environment limits the amount of mailbox delegation available to users. Additionally, users in one environment — on-premise or Exchange Online –cannot view the free/busy information of users in the other environment.
  • A rich coexistence scenario is more robust overall and will eliminate the mailbox delegation issue and will also share free/busy info.If you implement a rich coexistence environment, you’ll also be able to move mailboxes seamlessly between on-premise deployment and the cloud. You can also use on-premise Active Directory and Exchange management tools to manage all mailboxes, whether on-premise or in the cloud.

Once you’ve decided to make the switch to Office 365, there are two different migrations processes depending on which platform you’re running.

There is

  1. The Exchange migration plan
  2. The IMAP migration plan.

If you choose the Exchange migration plan, you can migrate an existing Exchange 2003, Exchange 2007 or Exchange 2010 environment to Office 365. This option is also called a “simple Exchange migration” or a “cutover migration” because you move all on-premise applications.

You should use the IMAP migration plan if you need to migrate IMAP-enabled servers, including Exchange 5.5 and Exchange Server 2000, to Office 365


Migrate All Mailboxes to the Cloud – E-mail Migration in the Exchange Control Panel to migrate all the mailboxes and corresponding mailbox data from Microsoft Exchange to your cloud-based e-mail organization. This type of migration is called a cutover migration because all on-premises mailboxes are migrated in preparation for moving your entire e-mail organization to the cloud.

What happens during a cutover Exchange migration

When you migrate Exchange mailboxes to the cloud in a cutover Exchange migration:

  • The migration service provisions new mailboxes in your cloud-based organization. It creates a cloud-based mailbox for each user account in your on-premises Exchange organization. On-premises distribution groups and contacts are also migrated to the cloud.
  • After the new cloud-based mailboxes are created, the migration service migrates e-mail messages, contacts, and calendar items from the Exchange mailboxes to the corresponding cloud-based mailboxes.
  • After the initial migration, the Exchange and cloud-based mailboxes are synchronized every 24 hours, so that new e-mail sent to the Exchange mailbox is copied to the corresponding cloud-based mailbox. This process is called incremental synchronization.

When you’re ready, you can route e-mail directly to the cloud-based mailboxes and delete the migration batch. Then you can remove your on-premises Exchange organization if you want.

Important NOTE: If you’ve activated and installed the Microsoft Online Services Directory Synchronization tool, you can’t run a cutover Exchange Migration. If you’ve installed the directory synchronization tool, you can deactivate directory synchronization and then run a cutover Exchange migration.




2 comments on “Office 365 – Migration approach

  1. Pingback: Office 365 – Migration approach « PREMNAIR'S Blog

  2. Pingback: Office 365 – Cloud configuration – Live « Microsoft Office 365 @ Middle East Region

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