The user principal names (UPN), email addresses, or proxy addresses of users contain an Office 365 domain after synchronization

I had this problem the first time our AD synched to EOA.

The user principal names (UPN), email addresses, or proxy addresses of users contain an Office 365 domain after synchronization

Manually install Office 365 desktop updates – Office 365 Service Administration – Office 365 – Microsoft Office 365 Community

 

Manually install Office 365 desktop updates – Office 365 Service Administration – Office 365 – Microsoft Office 365 Community