Use the Office 365 Setup wizard in the old admin center to perform a cutover migration

If Office 365 Setup wizard detects that you have a server running Exchange 2013, Exchange 2010, or Exchange 2007 on-premises, and you have fewer than 151 mailboxes, it recommends that you use the Office 365 Setup wizard to copy data and add users all at the same time. Office 365 uses a process called cutover migration to accomplish this.

Read What you need to know about a cutover email migration to Office 365 for an overview of the cutover migration process if you want more information before you get going.

Use the Exchange admin center (EAC) to perform a cutover migration. See Perform a cutover migration of email to Office 365 using the EAC.

Looking for Windows PowerShell commands? See Use PowerShell to perform a cutover migration to Office 365.

Cutover migration tasks

Here are the tasks to complete when you are ready to get started:

Before the Office 365 Setup wizard can copy your email data and create users for you, you must complete a few changes to your on-premises Exchange Server environment.

Note: If you have turned on directory synchronization, you need to turn it off before you can perform a cutover migration. You can do this in the old Office 365 admin center: USERS > Active Users > Active Directory synchronization > Manage.

  1. Configure Outlook Anywhere on your on-premises Exchange Server     The email migration service uses Outlook Anywhere (also known as RPC over HTTP) to connect to your on-premises Exchange Server. Outlook Anywhere is automatically configured for Exchange 2013 and Exchange Server 2016. For information about how to set up Outlook Anywhere for Exchange 2010 andExchange 2007, see the following:

  2. You must use a certificate issued by a trusted certification authority (CA) with your Outlook Anywhere configuration in order for Office 365 to run a cutover migration. For cutover migration, you will have to add the Outlook Anywhere and Autodiscover services to your certificate. For instructions on how to set up certificates, see:

  3. Optional: Verify that you can connect to your Exchange organization using Outlook Anywhere     Try one of the following methods to test your connection settings:

  4. Set permissions     The on-premises user account that you use to connect to your on-premises Exchange organization (also called the migration administrator) must have the necessary permissions to access the on-premises mailboxes that you want to migrate to Office 365. This user account is used when you Connect Office 365 to your email system later in this procedure.

  5. To migrate the mailboxes, the admin must have one of the following permissions:

    • The migration administrator must be a member of the Domain Admins group in Active Directory in the on-premises organization.


    • The migration administrator must be assigned the FullAccess permission for each on-premises mailbox.


    • The migration administrator must be assigned the Receive As permission on the on-premises mailbox database that stores users' mailboxes.

    For instructions about how to set these permissions, see Assign Exchange permissions to migrate mailboxes to Office 365.

  6. Disable Unified Messaging (UM)     If UM is turned on for the on-premises mailboxes you’re migrating, turn off UM before migration. Turn on UM or the mailboxes after migration is complete. For how-to steps, see Disable Unified Messaging for users for Exchange 2007.

  7. Create security groups and clean up delegates    Because the email migration service can't detect whether on-premises Active Directory groups are security groups, it can't provision any migrated groups as security groups in Office 365. If you want to have security groups in Office 365, you must first provision an empty mail-enabled security group in Office 365 before starting the cutover migration.

    Additionally, this migration method only moves mailboxes, mail users, mail contacts, and mail-enabled groups. Objects that have a manger or delegate relationship to each other must be moved together for that relationship to continue to work. If you're not going to move all the objects that are assigned as a manger or delegate to another object, then remove the relationship before you start the migration.

In the Office 365 admin centerHome page, click go to the old admin center.

Then, choose SETUP > Start setup now.

The first step is to show us that you own the each of the domains you'll be bringing to Office 365 .

  1. On the Let's personalize your setup page, choose Yes, I need to copy data for my users and then in the What is your current email system? box, choose the version of Exchange. In the How many users do you have? box, specify the number of users (less than 151).

  2. In the setup wizard, on the What you need to know about domains and DNS page choose Let's get started.

    If you want to learn more about domains, view the video on the page.

  3. On the Which domain do you want to use? page, type in your domain, for example,

  4. The Add this TXT record to show you own <your domain name> page lists a TXT record that is specific to you in the format "MS=ms########". Add this at your DNS host. For instructions, see Create DNS records for Office 365 when you manage your DNS records.

    After you have added the TXT record at your DNS host, wait a few minutes, and then choose Okay, I've added the record to go to the next step.

    Add TXT record to verify you own the domain.

    Note: The TXT record is usually verified quickly, but if you receive an error, wait awhile, and then select Okay, I've added the record again.

  5. On the We've verified that you own <your domain name> page, click Next.

Instead of adding users, the Office 365 Setup wizard will add the new users during the data copying process. On the Skip adding users page, click Next.

Now you are ready to start copying your data.

  1. Review the information on the Get ready to copy data to Office 365 page, and click Next.

  2. On the Let's get connected page, make the following entries:

    • In the Email address box, enter the email address of any on-premises mailbox user.

    • In the User name box, enter the user name of the migration administrator for the on-premises Exchange Server.

    • In the Password box, enter the password for the migration administrator for the on-premises Exchange Server.

  3. Choose Start copying.

    Enter account information to connect to your Exchange server.
  4. The Copying in progress page will display while your data is being copied. You can also click on the Exchange admin center link to view the status of migration batches and see how your migration is progressing. You might have to click the refresh button to see the status, as shown in the following figure.

    Click refresh to view synchronizing mailboxes.

After Office 365 Setup wizard, you will need to finish setting up your domain. See Create DNS records for Office 365 when you manage your DNS records for instructions specific to your DNS host.

The Office 365 Setup wizard creates the users and their mailboxes in Office 365. However, you will still have to assign licenses to each user. If you don't assign a license, the mailbox is disabled when the grace period ends (30 days). To assign a license in the Office 365 admin center, see Assign licenses to users in Office 365 for business.

See Also

What you need to know about a cutover email migration to Office 365

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