I work at a Fortune 250 company that many slashdotters would recognize if I put out the name. Our IT department has been planning the rollout of Windows 7 for quite a while now and it's going to take time simply because of the amount of testing that has to be done. They have to make sure all of the applications that we use on a regular basis (some of which are built internally) work fine with the new operating system and work as expected. Then they have to make sure all of our hardware is compatible. When you have tens of thousands of workstations that's a lot of hardware to check. Yes there is desktop standardization to a degree but even then you have those users that have to have a custom piece of hardware for their job that isn't in other configurations. Frankly right now is about the time most companies need to start a migration plan if they haven't already. It won't be too much longer before Microsoft stops supporting XP entirely and no longer issues any security patches. And having an operating system like Windows XP operating unpatched is definitely not a good thing.