Advanced Email Migration to Office 365 from a POP3 Service Provider – Part 3


Adding an Email Alias to an AD Account and Syncing Changes to Office 365

In the previous post, we setup configured the primary and transition domains in Office 365.

In this post we are going to make the changes to the AD account, Sync the changes to Office 365 and activate the user in Office 365.

Because Office 365 limits us from adding email aliases, for vanity domains, to users; we need to make the changes on the AD account and sync them to Office 365. These changes are done with ADSI Edit and modifying the proxyAddresses field on the AD user account.

  1. Select a user account to migrate to Office 365
  2. Open ADSI Edit
  3. Connect to the domain and navigate to the User OU
  4. Navigate to the User Account
  5. Right Click, Properties
  6. Find and Click the proxyAddresses field
  7. Click Edit
  8. Add SMTP aliases (both contoso.com and mail.contoso.com)
  • When you add new email aliases, you want to make sure that you primary address will start with UPPERCASE SMTP. Your additional addesses will start with lower case smtp. The uppercase SMTP denotes it as the primary address.
  • Examples:
  • SMTP:userid@contoso.com
  • smtp:user@mail.contoso.com
  • Assuming that userid is the same as the current email address.
  1. Click OK
  2. Click Apply
  3. Click OK

Now that we have the user account email aliases are setup we need to sync those changes to the user account in Office 365. Once the account is synced, then activate and license the account in Office 365.

  1. Login to the Directory Sync Server and sync the changes (Start-OnlineCoexistenceSync)

    WAIT 5 minutes for the changes to Sync to Office 365

  • Open IE and navigate to Office 365 Portal and login with the admin account
  • Click Users
  • Check mark the user that you want to activate
  • Click Activate Synced Users
  • Select a location
  • Assign a License
  • Click Next
  • Click Activate
  • Click Finish

WAIT 5 minutes for Microsoft Office 365 to process the account activation and provision the licensed services to the user

If you navigate to the user account in the Exchange Online Control Panel and view the properties of the user account, the SMTP aliases should be listed (both contoso.com and mail.contoso.com)

Now that the user is activated and has both SMTP aliases we can continue to the next step and forward the email from the legacy provider to Office 365

Series of Posts

  1. Advanced Email Migration to Office 365 from a POP3 Service Provider – Part 1
  2. Office 365 and DNS Setup for the Transition Email Domain – Part 2
  3. Adding an Email Alias to an AD Account and Syncing Changes to Office 365 – Part 3
  4. POP3 Email Forwarding to Office 365 – Part 4
  5. Client Setup and Data Migration – Part 5

Thanks for visiting and reading my posts. I am always looking for more ideas. Please comment or email me with what you would like to see.

Kelsey Epps

Office 365 MVP

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2 thoughts on “Advanced Email Migration to Office 365 from a POP3 Service Provider – Part 3

  1. Obinna

    Thank you for sharing this. Please I need some clarification, I have about 100 accounts on a POP3 provider (webmail) does it mean I will have to do this for each one of the accounts? How do I get the accounts into Office 365, or do I recreate each account on office 365? Please when you say AD account and ADSI where do I find this, is this part of of office 365 plan ? clarify

    Reply

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