Microsoft Studios is still active in the vast pc gaming community although its mostly though affiliates now days.
http://en.wikipedia.org/wiki/Microsoft_Game_StudiosThis list of games is sorted by platform and includes games published by Microsoft. For those games not developed under the Microsoft name, the developer is noted after the game's release date.
[edit]MS-DOS/Windows
1990
Microsoft Entertainment Pack
1994
Microsoft Space Simulator
1995
Microsoft Golf
Hover!
1996
Monster Truck Madness
Close Combat
Microsoft Beyond the Limit: Ultimate Climb
Microsoft Soccer
Microsoft Golf Version 3.0
Microsoft Flight Simulator '95
Deadly Tide
Fury3
Gex (now by Eidos)
Hellbender
1997
Return of Arcade Anniversary Edition
Age of Empires
Microsoft Flight Simulator '98
Close Combat: A Bridge Too Far
Fighter Ace
Microsoft CART Precision Racing
Microsoft Entertainment Pack: The Puzzle Collection
1998
Urban Assault
Outwars
NBA Full Court Press
Monster Truck Madness 2
Motocross Madness
Microsoft Pinball Arcade
Microsoft Golf 1998 Edition
Age of Empires: The Rise of Rome
Close Combat III: The Russian Front
Combat Flight Simulator WWII Europe Series
1999
Pandora's Box
NBA Inside Drive 2000
NFL Fever 2000
Midtown Madness
Age of Empires: Gold Edition
Age of Empires II: The Age of Kings
Asheron's Call
Microsoft Baseball 2000
Microsoft Flight Simulator 2000
2000
Starlancer
Motocross Madness 2
Midtown Madness 2
Age of Empires II: The Conquerors
Allegiance
Combat Flight Simulator 2: WWII Pacific Theater
MechWarrior 4: Vengeance
Microsoft Baseball 2001
Microsoft International Soccer 2000
Links LS Classic
Microsoft A.I.Puzzler
Crimson Skies
2001
Racing Madness 2
Microsoft Train Simulator
Microsoft Flight Simulator 2002
MechWarrior 4: Black Knight
Zoo Tycoon
2002
Age of Mythology
Rallisport Challenge
Combat Flight Simulator 3: Battle for Europe
Dungeon Siege (Gas Powered Games)
Links 2003
MechWarrior 4: Clan Mech Pak
MechWarrior 4: Inner Sphere Mech Pack
MechWarrior 4: Mercenaries
Asheron's Call 2
MechCollection
Zoo Tycoon: Dinosaur Digs
Zoo Tycoon: Marine Mania
2003
Rise of Nations
Age of Mythology: The Titans
Dungeon Siege: Legends of Aranna (Gas Powered Games)
Freelancer
Halo: Combat Evolved
Impossible Creatures
Kings & Myths: The Age Collection
Links 2003: Championship Courses
Links Championship Edition
Microsoft Flight Simulator 2004: A Century of Flight
Zoo Tycoon: Complete Collection
2004
Rise of Nations: Thrones and Patriots
Age of Mythology Gold Edition
Zoo Tycoon 2
2005
Age of Empires III
Age of Empires III Collector's Edition
Dungeon Siege II (Gas Powered Games)
Fable: The Lost Chapters
Zoo Tycoon 2: Endangered Species
2006
Rise of Nations: Rise of Legends
Age of Empires III: The WarChiefs
Microsoft Flight Simulator X
Zoo Tycoon 2: African Adventure
Zoo Tycoon 2: Dino Danger Pack
Zoo Tycoon 2: Marine Mania
Zoo Tycoon 2: Zookeeper Collection
2007
Shadowrun
Halo 2
Age of Empires III: The Asian Dynasties
Microsoft Flight Simulator X: Acceleration
Viva Piņata
Gears of War
Zoo Tycoon 2: Extinct Animals
2008
Zoo Tycoon 2: Ultimate Collection
2009
Mahjong Tales: Ancient Wisdom (Games for Windows Live)
Tinker (Games for Windows Live)
World of Goo (Games for Windows Live)
Osmos (Games for Windows Live)
Where's Waldo? The Fantastic Journey (Games for Windows Live)
2010
Fable III
2011
Age of Empires Online
Microsoft Flight
Interesting read about "stepping up effort for pc games"... from Microsoft Game Studios.
http://www.shacknews.com/onearticle.x/65724