Forum Discussion
Local domain mailbox migration error
I ran into an issue while migrating from on-premise to O365. On-premise AD domain is “domain.local” so users have their mailboxes smtp address as follows: primary smtp mailto:email address removed ...
The domain.local format is not supported in the online environment.
Only officially purchased domains are supported.
You must add a public domain(UPN suffix) in the Active Directory Domains and Trusts console and then change all user accounts to the public domain(UPN suffix).
I know that, but I'm talking about the "AD internal domain" which is by default added to all exchange users created.
Each user has his primary SMTP address as user @ domain.com which is the public domain and an alias pointing to the AD domain domain.local.
We made several migration and never happened that the internal AD domain was rejected during the migration