Thanks, Jeff. That os what understood as well. To answer your question, work bought a number of macs for various different locations with iWork pre-installed. They were set up to work with any apple ID, just as iLife is. So all I had to do was run Software Update. The App Store then lists what needed to be updated, the updates included, iPhoto, OSX 10.8.3, Pages, Number & Keynote.. I clicked update all. It asked me for an Apple ID. I signed in with mine (I should have created a work one dirst, doh!) and they all updated.
We had some machines that didn't work that way (my plan was to use a different 'work' apple ID for each location).
I'm in process of working this out with Apple. They are going to have to refund iWork for some of the machines & repurchase. Sounds to me like the original install was wrong before they shipped them.
Hope that answers your question.