Bloat
I think we need to remember that, along with new features and shiny bling, MS have had to put up with "my stone-age application, cavepaint 22B.C., must work, dammit!" from all comers. It's this backwards compatibility that has caused a lot of the beer gut Windows currently has.
I'm not for one second saying MS is blameless for the lardy arse-cheeks dangling pendulous over the edge of the platters in your HDD, just that they have been, on occasion, unfairly criticised for bloat when it's in response to customer demands for legacy code not to break - without the ability to recompile it against newer libraries. It's a bit like the stick Pirelli is currently getting for crap tyres that don't last 31 laps after F1 management asked them for crap tyres that won't last 31 laps...
Icon: Devil's advocate, natch.