Re: Incomplete...
Name a server OS feature/API that was dropped in a later version - and which didn't became really obsolete (i.e., IPX support is not a valid one <G>)
It is not true that "any non trivial software will always needs tweaking to make it work on the next Windows version". If it needs, it means it did something "dirty" to take shortcuts in development.
Raymond Chen's "The Old New Thing" is full of "horror stories" about how many developers screw up taking shortcuts .- and often what MS is forced to do under the hood of Windows to ensure some applications written or used by some large customers still work....