They are OEM but still come with the disc
Big Vista fan here.
One of the biggest problems I've found (and I am not accusing you of this, it is a general observation I've seen repeated many times over the years) with moving to a new operating system or application is the "power" user. The novice user and the expert user generally don't have any problems moving from one OS to another, they just get on with it and they pick up the changes pretty quickly.
The "power" user, on the other hand, has taught himself a few "smart tricks" to make himself look like an expert. Somebody who people come to when they have problems. They don't understand the basics of how an operating system work, or how a particular type of application works, they know how to tweak a particular version, which makes them look good.
They are scared about moving to a new OS, package or version, because they will go from "power" user to "normal" user, until they learn the tips and tricks for the new version and that represents a loss of face, until they have found a source of useful tips-and-tricks on the internet or in a magazine.
This group of users are often very hostile to new versions of applications, whether they are better or not.