I have hybrid Exchange 2010SP3, Office 365. DirSync no ADFS.
User primary address and UPN is 'firstname.lastname@example.org' but they do have 'alias@domain.Local' email address.
When user got synched to the cloud some recipient have 'email@example.com' and some don't. All attributes of the users are identical and not using any filtering on DirSync related to '.local' domain.
I think either all should have firstname.lastname@example.org or none. What could be the reason?