I am trying to clean up our Exchange 2013 environment before going to O365, our company has some OLD Email Address Policies in place... the default, contains smtp addresses email@example.com which is not a primary SMTP nor even in use. We also have the old X400 address in there.
I want to remove these, and apply... would this cause any issues, provided that no use has been using the firstname.lastname@example.org email address or the X400 address? After applying, this will remove the addresses from the users mailboxes correct?
I know that after running the Office 365 hybrid config wizard we our tenant will be added to it, which is fine...
Anything Im overlooking? Any gotchas? Thanks in advance.