Good Afternoon
Firstly thanks for taking the time to read this post.
I am doing a simple EX2010 > O365 migration.
Mailboxes migrate w/out issue but I have noticed that I am using the default target delivery domain instead of changing to the primary SMTP address.
For example that would be XXXXXX.mail.onmicrosoft.com
All domains we are using however have been verified at the MS end. Once the migration is complete I will be pointing the MX records for the primary domain to Microsoft.
Looking at this article, seems others have asked the same issue and I believe using the default target delivery domain should be okay? Could someone kindly confirm please.
https://learn.microsoft.com/en-us/answers/questions/257837/remote-move-migration-to-exchange-online-target-de.html
Many than,s