Office 365 Domain name change/add

[rupandalmeida]

HI All,

Need Solution for below requirement : 

We have abc-sa.org domain which is owned & added in to office365. Recently we bought a new domain called abc.org.sa & we want all incoming & outgoing emails should use new domain name (abc.org.sa). What is the best solution ?

We have Primary & Secondary Domain controller. We are using Azure AD connector for syncing the AD objects from on-premise.
We are okay for authentication can happen through old domain ID (abc-sa.org)

Thanks in Advance

Regards
Rupan Dalmeida

[#2 · Accepted solution]

@rupandalmeida 

1. Verify domain in O365 and complete DNS setup

2. Add new domain as additional UPN suffix in on-prem AD

3. Change some test users UPNs to new UPN

4. Change email addresses to match (test a few users first)

5. Change email address policy in Exchange on-prem (assuming you have one, which you should) and update everyones UPN

6. Tell everyone to use new email/UPN from now on.

[#3]

@CloudHal 

Thanks for your response..

We do not have Exchange on-prem. We only have primary & secondary domain controller & AAD Connect to sync the AD objects from on-prem to cloud. 

We have 50 users.

Please let me know whether this solution still works ??

[#4]

How do you manage email addresses for users then? You have to do this in AD, the normal way (and in fact only supported way) is to have a minimal exchange server which you use to provision cloud mailboxes by writing the email attributes to the AD user object. If you have exchange OnPrem you could also then use an email address policy to update everyone’s addresses.
So you are just going to have manually add the email addresses instead of using a policy however you would normally do it. Or use powershell.
You should be aware however that your current config is not supported.

[#5]

@halbot @CloudHal 

Solution implemented successfully.. Thank you so much for the help..

Regards

RD