I have a 2003 server, which is on failing hardware. I have moved all the data off of it, now I'm onto the tricky part of moving services away from the machine.
I have installed a second exchange server on the domain, and I have moved some mailboxes over to it, and the seem to work okay.
What I want to do, is have exchange B taking delivery of email directly, instead of exchange A.
What I plan to do is update the MX record, and add ExchangeB and then once DNS has updated everywhere, I will remove ExchangeA from the record.
Where I get confused, is do I need to update anything in exchange?