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United States
- 343 Industries – Halo series
- Connected Experiences – Untitled Project – Design Large scale multiplayer title and help other first party studios
- Good Science Studio – Kinect Adventures, Kinect Fun Labs
- Kids and Lifestyle Entertainment – Untitled Project
- Microsoft Studios – Los Angeles – Untitled Project
- Microsoft Studios – Mobile Gaming – ilomilo
- Microsoft Studios – Redmond Publishing – Overseeing and co-developing multiple projects in conjunction with third party development studios
- Platform Next Studios – Untitled Project
- Playful Learning – Untitled Project
- Skybox Sports – Untitled Project
- Turn 10 Studios – Forza Motorsport series
- Twisted Pixel Games – The Gunstringer, LocoCycle
- Xbox Live Productions – South Park Let's Go Tower Defense Play!, South Park: Tenorman's Revenge, Avatar Kinect
Europe
- Lionhead Studios – Fable series, Black & White series; Unannounced MMO-like New IP
- Microsoft Studios – London – Untitled Free-To-Play Project
- Rare Ltd. – Banjo-Kazooie series, Viva Piñata, Perfect Dark series, Kinect Sports series
- Soho Productions – Kinect Sesame Street TV
- Press Play – Untitled Project
Canada
- BigPark – Joy Ride series, Kinect Sports: Season Two
- Black Tusk Studios – Untitled Project
- Microsoft Studios Victoria – Untitled Project
− Non Game Development
- Microsoft Studios – Sentient Team Working with internal and external teams and sharing new technologies
- Microsoft Studios – Skype Xbox Engineering Team Bringing Skype communication software to Xbox platforms through Xbox Live
- Microsoft Studios – Games Testing Organization Responsible for games and entertainment testing; from crash processing, telemetry and data visualization, to automating Xboxes
- Microsoft Studios – Technology and Incubation Group Advancing new products and technologies
- Microsoft Studios – Xbox Core Platform team API and SDK development
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- 4J Studios – Banjo-Kazooie, Banjo-Tooie, Minecraft, Perfect Dark (Xbox Live Arcade ports)
- Ankama Games – Islands of Wakfu
- Asobo Studio – Kinect Rush: A Disney Pixar Adventure
- Blitz Games – Fuzion Frenzy
- Blind Wink Games – Matter
- Blueside – Kingdom Under Fire series
- Bongfish GmbH – Harms Way, Avatar Motocross Madness
- Certain Affinity – Crimson Alliance, Halo 2 (Map packs), Halo: Reach (Map packs), Halo: Combat Evolved Anniversary (Map packs), Halo Waypoint
- Climax Group – Sudeki, Bloodforge
- Compulsion Games – Contrast
- Crytek – Ryse
- Digital Leisure – Dragon's Lair
- Digital Reality – Sine Mora
- Double Fine Productions – Iron Brigade, Double Fine Happy Action Theater
- Epic Games – Gears of War series, Shadow Complex
- Frontier Developments – Kinectimals, Kinect Disneyland Adventures
- Ftoni Studios – Untitled Project
- FunTown World Limited – FunTown Mahjong
- Gaia Industries – Street Trace NYC
- Gastronaut Studios – Small Arms, Gel: Set & Match
- Gas Powered Games – Age of Empires Online
- Grasshopper Manufacture – Diabolical Pitch, Sine Mora
- Grounding Inc. – Crimson Dragon
- Harmonix – Dance Central series
- Hidden Path Entertainment – Wits and Wagers
- Hudson Soft – Fuzion Frenzy 2
- Humble Hearts – Dust: An Elysian Tail
- iNiS – Lips series
- InterServ – Word Puzzle
- Iron Galaxy Studios – Wreckateer, Ms. Splosion Man (iOS, Windows Phone 7 ports)
- Klei Entertainment – Mark of the Ninja
- Krome Studios – Full House Poker, Scene It? Box Office Smash, Game Room, Viva Piñata: Party Animals
- Little Boy Games – Go! Go! Break Steady
- Luma Arcade – The Harvest
- Mistwalker – Lost Odyssey
- Naked Sky Entertainment – RoboBlitz
- NanaOn-Sha – Haunt
- NinjaBee – Band of Bugs, A Kingdom for Keflings, A World of Keflings, Cloning Clyde, Dash of Destruction, Outpost Kaloki X
- Playground Games – Forza Horizon
- Q Entertainment – Ninety-Nine Nights series
- Relentless Software – Kinect Nat Geo TV
- Remedy Entertainment – Alan Wake series
- Robot Entertainment – Orcs Must Die!, Age of Empires Online
- Ruffian Games – Crackdown series
- Runic Games – Torchlight series
- Sarbakan – Lazy Raiders
- Screenlife / WXP – Scene It? Lights, Camera, Action
- Shadow Planet Productions – Insanely Twisted Shadow Planet
- Signal Studios – Toy Soldiers, Ascend: New Gods
- Silicon Knights – Too Human
- Singapore-MIT GAMBIT Game Lab – CarneyVale: Showtime
- Ska Studios – The Dishwasher series
- Slapdash Games – TiQal
- Slick Entertainment – Scrap Metal
- Smart Bomb Interactive – Snoopy Flying Ace
- Smoking Gun Interactive – Home Run Stars
- SouthEnd Interactive – Lode Runner 2009, ilomilo
- Stairs Studio – ?????
- Starfire Studios – Fusion: Genesis
- Strange Flavour – TotemBall
- Tequila Works – Deadlight
- TikGames – Texas Hold 'em
- Torpex Games – Schizoid
- tri-Ace – Infinite Undiscovery
- Undead Labs – State of Decay
- Vector Unit – Hydro Thunder Hurricane
- Zen Studios – Pinball FX series, CastleStorm
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- Aces Studio – Microsoft Flight Simulator series
- Bungie – Halo series
- Carbonated Games – Hexic series
- Ensemble Studios – Age of Empires series
- Flight Team – Microsoft Flight
- Hired Gun – Halo 2 for Windows Vista
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- Artoon – Blinx series, Blue Dragon
- Beep Industries – Voodoo Vince
- BioWare – Mass Effect, Jade Empire
- Bizarre Creations – Project Gotham Racing series
- Dark Energy Digital – Hydrophobia
- Digital Anvil – Brute Force, Freelancer
- DreamWorks Interactive – The Neverhood Chronicles
- FASA Studio – MechWarrior series
- feelplus – Lost Odyssey
- Fuel Industries – Tinker
- Game Republic – Every Party
- Indie Built – Amped series
- Ninja Theory – Kung Fu Chaos
- The Neverhood, Inc – The Neverhood Chronicles
- Turbine – Asheron's Call
- Wingnut Interactive
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