In the corporate IT world this is welcome news, believe me with the number of Applications most companies have now it is a MAJOR nightmare to change the OS. Making sure all the legacy software will work, and that all of the hardware drivers are avaliable for the new OS - Ohhh the pain... I woek for a large company and we have some mission critical applications that are still text based (think MSDOS style) that we have never been able to port over to Windows, and some of our hardware is still SNA as in connected to the network with RG58U cable just like Cable TV. The problems porting these apps and replacing the hardware are huge, we figure 8 Million to upgrade our CRM software to a current version that will run on Win 7, and the vendor is not sure if the data can be converted properly, it may require starting fresh and that is not a good option.
There is so much more to corporate IT than the PC OS, even installing service packs is risky, XP SP2 broke 1/3 of the Colour Printer drivers in our fleet and that was minor compared to what a full OS upgrade would cause.
I can easily see XP remaining popular in corporate IT for at least 5 more years if not longer.
Don't get me wrong tho, I love Win 7, (didn't have problems with Vista either), but there are just so many other things that have to be either upgraded or replaced before an OS change in a large environment.