I don't seem to fathom the fixation of comparing Desktops?
To put it very simply Desktops are for personal users!
In govt / educations / business uses the stress should be on purpose built applications. There is no need for fancy desktops!
MS is a PERSONAL COMPUTER user (CONSUMER) oriented product. I have seen friends and colleagues buying upgrading their pcs just so that they can talk about it with your friends / colleagues who have just got it. Its like your wife demanding a fully loaded BMW to drop the child to the school just because your neighbour does it in her fully loaded MERC!! It the MO thing, MO GRAPHICS, MO MULTIMEDIA, MO MONEY .......
I bet 90% of the users don't use 90% of its features.
Specially in case of India S/w for govt / education / etc it should be no - nonsense, no frills attached, lean and trim and think Linux fits the bill.
Parimal Shah