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Cutover Migration to Office 365

Cutover Migration
As part of an Office 365 deployment, you can migrate the contents of user mailboxes from a source email system to Office 365. When you do this all at one time, it's called a cutover migration. Choosing a Cutover Migration is suggested when: your current on-premises Exchange organization is Microsoft Exchange Server 2003, Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, or Microsoft Exchange Server 2013; or
your on-premises Exchange organization has fewer than 2,000 mailboxes.

Plan for Migration
Setting up an email cutover migration to Office 365 requires careful planning. Before you begin, here are a few things to consider:
- You can move your entire email organization to Office 365 over a few days and manage user accounts in Office 365.
- A maximum of 2,000 mailboxes can be migrated to 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 accepted as a domain owned by you in your Office 365 organization.
- After the migration is complete, each user who has an on-premises Exchange mailbox will be a new user in Office 365, but you will still have to assign licenses to users whose mailboxes are migrated.

Impact to Users
After your on-premises and Office 365 organizations are set up for a cutover migration, post-setup tasks could impact your users.

- Administrators or users must configure desktop computers
Make sure that desktop computers are updated and set up for use with Office 365. These actions allow users to use local user credentials to sign in to Office 365 from desktop applications. Users with permission to install applications can update and set up their own desktops, or updates can be installed for them. After updates are made, users can send email from Outlook 2013, Outlook 2010, or Outlook 2007.

- Potential delay in email routing
Email sent to on-premises users whose mailboxes were Migrate to Microsoft 365 are routed to their on-premises Exchange mailboxes until the MX record is changed.

Steps to Perform a cutover migration, follow these steps:

- As an administrator, communicate upcoming changes to users and verify domain ownership with the domain registrar.
- Prepare the servers for a cutover migration and create empty mail-enabled security groups in Office 365.
- Connect Office 365 to the on-premises email system (this is called creating a migration endpoint).
- Migrate the mailboxes and then verify the migration.
- Grant Office 365 licenses to your users.
- Configure the domain to begin routing email directly to Office 365.
- Verify that routing has changed then delete the cutover migration batch.
- Complete post-migration tasks in Office 365 [assigns licenses to users and creates an Autodiscover Domain Name System (DNS) record], and optionally decommission the on-premises Exchange servers.
- Send a welcome letter to users to tell them about Office 365 and to describe how to sign in to their new mailboxes.

To know more about Tenant to Tenant Migration Office 365 visit O365CloudExperts.