Cutover migration (bullets)

This post is a “quick note” to help on a cutover migration.
Exchange 2013, Exchange 2010, Exchange 2007 & Exchange 2003 versions are supported.

  1. Add your domain to Office 365 & verify
    This step requires access to the public DNS registar to create a txt record to verify the domain ownership.
  2. Configure Outlook Anywhere (link)
  3. Add public certificate and enable it for IIS & SMTP (Instructions for Exchange 2003, 2007, 2010, 2013)
  4. Disable UM
  5. Check Primary SMTP
    The Primary SMTP address of each on-premises mailbox is used to create the email address for a new Office 365 mailbox
  6. UPN
    The UPN is used to create the username for the Office 365 user. It is convenient to change the UPN to match the Primary SMTP. This way the new user will have [email protected] for username (login). If the UPN is local then the new user will be created with [email protected] username.
  7. Hide not needed mailboxes
    Cutover migration moves all mailboxes, mail users, mail contacts, and mail-enabled groups that are listed at the GAL. All hidden from address list are excluded.
  8. Mail enable security groups
  9. Create migration endpoint
  10. Create migration batch
  11. Start the migration batch
  12. Change MX & Autodiscover records to point to O365
    When all mailboxes are migrated to O365, change the MX & Autodiscover records to point to O365. In Exchange 2007, Exchange 2010, and Exchange 2013 you should also set Set-ClientAccessServer AutodiscoverInternalConnectionURI to Null.
  13. Stop & Delete the migration batch
  14. Assign licenses
  15. Remove on-premises Exchange

A very nice article about this: Perform a cutover migration of email to Office 365


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