I called, gave the R00# ( They never asked for the S00# ) and asked if the receiver was good to be given to another account holder, and if they could activate it. The lady said "Yes"
May try the tech support folks tonight, need a 2nd opinion.
I orginally got the 721 from Claude @ dishstore, ended up doing an RMA with Dish in Sept of 07. Worked fine, then took it out of service in Dec of 07 because I got a new HDTV, and a 722. So I dunno. May try to sell local, so won't have to deal with shipping in case it can't be activated.
Other than taking 20 minutes to "Boot up" it was a great receiver when it behaved.