Hello,
we have a local Exchange 2003 envirnonment, that hosts actually all the mailboxes. In addition we have a new Exchange 2010 Server for the hybrid scenario. Public DNS is hosted by 1&1 and there are already existing MX records for the public IP adress from the smarthost. What is the best way to change the MX record to point on Office 365 - users should´t notice anything. How does the mail flow change, when an external Email arived for a mailbox hosted on Exchange 2003/2010 on-Premise?
Another question: DirSync is already in place, unfortunately all users have obtain a @onmicrosoft.com domain, is it possiable to change to the other primary domain?