We help IT Professionals succeed at work.
Get Started

Office365 Tenant to Tenant 'slow' Migration - How to handle the directory

123 Views
Last Modified: 2018-06-02
Slow Office365 Tenant to Tenant migration.

I want to migrate slowly from O365 Tenant A (Exchange Online) to a separate O365 Tenant B (Exchange Online).

Users at the original tenant use the DNS domain firsttenant.com, users at the the second tenant use the DNS domain secondtenant.com.

Some challenges are:
- I migrate and cutover User1 to Tenant B. Now he is using the domain secondtenant.com. How the users not migrated will send emails to User1? One idea that I have is to setup the targetaddress field of that mailbox, so it will forward the emails for that account. And in this way the non-migrated users will be able to send emails seamless to the migrated users.

- Now User1 needs to send emails to Non-Migrated users... What would be the idea here? I Can create a temporal contact on Forest B for all the accounts (and delete them gradually when these mailboxes are migrated). Another option in my mind could be to always send emails to the addresses ending with firsttenant.com until the migration is completed. But is anyone of these ideas going to break the autocomplete/cached names in Outlook?.

Any others alternative for this?
Comment
Watch Question
Solutions Architect
CERTIFIED EXPERT
Top Expert 2016
Commented:
This problem has been solved!
Unlock 1 Answer and 2 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE