We have setup 2010 and 2013 Exchange for migration usage from Exchange 2003.
I have some query on remove smtp addrsss policy to non-authoritative from mailbox manager policy in Exchange 2003:
1) Will there be any mail flow impact after such changes, and EOP still pointing to Exchange 2003?
2) Is there any issue on inter mail flow routing for 2003, 2010 and 2013?
3) Any best practice or mail flow settings to be verify before such changes?