Defaulting a Vista Image to Microsoft Update instead of Windows Up

My Management has asked me if I is possible to have our Vista Defaulted to
Microsoft update so it will pull updates for all products instead of just
Windows itself. They would like to avoid users (or IT techs) having to walk
through the process after they receive a new machine to switch to MS update.

I am trying to stick to a completely automated image build Via Task
sequences, so basically I am searching for a command that I could execute
during either the Build or deployment task sequences for our Vista Image that
would turn MS updates on?

I have tried searching for this info, but searching on the term "Microsoft
Update" in the search query brings up 1000's of solutions not relative to
the concept of what I am trying to do, so I thought I'd just ask.