I have a situation where we have taken over an existing organisation with their own SMTP domain name and Exchange 2000 (we run 2003 sp1).
The business wants them to send and recieve as our name space (as well as still receive on theirs).
Am i correct in thinking i can change their MX records to our host, add the name space to my recipient policy, and extend my name space to their exchange org (as per M$ article http://support.microsoft.com/default.aspx?kbid=321721
After re-reading the above i think maybe not, as their org will not be authoritative for our name space?
n.b. their is currently a VPN link between the physical sites, but no forest/domain links.
a tried and tested methodology would easily be worth 500 pts...