Why are people so daft?
Win 7 boot times incresed by running virtual Win XP?
Are you plain stupid or did you forget to turn your brain on today?
You load Win 7 as normal, boot times are comparable to XP if not better.
you then can do one of two things, 1st option is to run the full win XP environment, which lets you use old hardware and software, and yes if your running a 64 bit Win 7 it will let you use 32 bit hardware in Win 7 XP mode, that is a huge plus point as you can get the best of both worlds and is something Linux folk probably cant do because driver support is flaky there anyway.
option 2, this is where business running on old incompatable software will jump up an down about, you install the app in win XP mode and its available on the Win 7 program menu, clicking on it will load the app as if you ran it native, its also smart enough to work out folders and drives
it works well, is fairly quick for what people will need it for, and if anyone wants to mention anything about 3D graphics dont, as with all VM software it wont work, but thats not the point of XP Mode
As for why would you upgrade, well here is the answer and one shor sighted admins will soon find out. you can stay with your windows XP, go for it, after all it is still very good just now, but when your CEO suddenly wants a new piece of hardware he has at home that isnt XP supported or your in house design team needs to change to newer software, you will soon find the upgrade cost is significantly higher, Case proven with Windows 7 not supporting direct upgrade from XP.
I know companies that are still using NT4, after all it works so why change it huh? well now they are screwed because the cost to change everything is now to great so they cant, and day by day complaints stack up because something isnt working as it "should" so yeah, save the cash in the short run, but it will only increase the cost of upgrading in the future, and there will come a point where that will happen.