Join SBS 2K3 domain and no updates

I'm trying Vista and found that if I check for updates from Vista before I
join my SBS 2K3 domain that I have 7 or so.
But, I also installed Vista on a few identical clients and joined them to my
domain before checking for updates and have noticed that these clients show
NO updates available when I check for updates.

Any ideas anyone?

I was able to use one of the machines that did get the updates and produce a
list of updates which allowed me to do a manual download on most and install
them that way.

Not a single update however after joining the domain and then checking for
updates!