Exchange 2016 Add the X500 address

Question

Hi

Migrate users in the a.com to b.com through ADMT. And enable mailboxes for migrated users in b.com (Exchange 2016). After exporting the user mailboxes (Exchange 2013) in the source a.com through PST and then importing them into Exchange 2016, do I need to add the X500 address of the source Exchange in the new Exchange 2016? Are there any other considerations?

Answer 1

Hi @ Tony Mu ,

Yes, you need to add the X500 address of the source Exchange server to the target Exchange server after migration. If the X500 address is not added, other users may experience bounced emails when sending emails to the migrated users.

You can refer to the following command to add the X500 address:

Set-Mailbox -Identity "John Smith" -EmailAddresses @{add="X500:/o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=John Smith"}

Some other considerations for migrating users and mailboxes are:

• Make sure that your source and target servers meet the system requirements and have the latest updates installed.
• Disable legacy TLS versions on your servers and clients and enable TLS 1.2 for security reasons.
• Test your migration plan in a lab environment before applying it to production.
• Monitor the progress and status of your migration batches and resolve any errors or warnings that may occur.
• Communicate with your users about the migration process and any changes that may affect them.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

I would. Otherwise, existing meetings, cached addresses and replies in Outlook may not work.