I have a client that wants a newer server , they currently have an old Dell Tower 10 user Windows 2003 32bit SBS Server with Exchange 2003. I plan to replace with a newer Windows 2008 SBS 64 bit server with Exchange 2007 or 2010. Several years ago I replace a Windows 2003 SBS server with Windows 2003 Standard Server and Exchange 2007 migrated using the DCPROMO method. I forgot what I did and needed to ask can I join another Windows 2008 SBS 64bit Server to a Windows 2003 SBS Server Domain, Create or join the Exchange 2007 or 2010 Exchange server to the existing Exchange organizaion and move mailboxes then demote the old Windows 2003 SBS Server to a member server. Any suggestions or things to look out for?