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Step 4: Post Migration

April 13, 2018 | by iaur | posted as Cutover (EXO), M365 Migration

Move MX to Office 365

Email systems use a DNS record called an MX record to figure out where to deliver emails. During the email migration process, your MX record was pointing to your source email system. Now that the email migration to Office 365 is complete, it’s time to point your MX record at Office 365. This helps make sure that email is delivered to your Office 365 mailboxes. Moving the MX record will also let you turn off your old email system when you’re ready.

Delete Migration Batch

  1. In the Exchange admin center, go to Recipients > Migration.
  2. On the migration dashboard, select the batch, and then choose Delete.
    Note: It can take a few minutes or the batch to be removed.
  3. In the Exchange admin center, go to Recipients > Migration.
  4. Verify that the migration batch is no longer listed on the migration dashboard.

This will stop incremental sync

Assign User License to user

Assign licenses to users in Office 365 for Business.

Create an Autodiscover DNS record for Outlook access

  1. Disable Autodiscover service for On-Prem
  2. Create autodiscover for Office 365

Note:  In Exchange 2007, Exchange 2010, and Exchange 2013 you should also set Set-ClientAccessServer AutodiscoverInternalConnectionURI to Null.

Office 365 uses a CNAME record to implement the Autodiscover service for Outlook and mobile clients. The Autodiscover CNAME record must contain the following information:

  • Alias:    autodiscover
  • Target:

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