2 sites - Both sites have a Windows 2003 DC which is also an Exchange 2003 Server. VPN setup between the offices. Both sites have each a new server just as a data server.
What needs to happen:
The two new servers at each location get DCPROMO and the roles transferred away from the current DC/Exchange 2003 box... Install Exchange 2007 on a new box and than transfer over the 2003 mailboxes to 2007.
When I transfer over the roles to the new DC will I mess up Exchange 2003?