To the archives! Here are highlights with links to Forza and FM.net’s history. I mostly use Internet Archive’s Wayback Machine links prior to the new forums in 2014 to preserve the site look but articles since 2011 can be found on the current website using their link extensions.
Since Forza Motorsport 4 was released I’ve included every announcement and Week in Review link in my spreadsheets for each game, found at www.ManteoMax.com
My calendar of Forza-related events also linked there includes the same stories plus Rear View Mirror and Heavy Metal Affliction articles for the last couple years.
Turn10Studios channel at YouTube: www.youtube.com/user/Turn10Studios
2001
Turn 10 Studios established. www.forzamotorsport.net/turn10
2005
Mar 29 - Popular Science: Race Against Reality article and video
May 3 - Forza Motorsport released (original Xbox). Wikipedia
2006
May 9 - E3: Forza Motorsport 2 teaser video. (27 minute mark): YouTube
May - Microsoft announces sponsorship of ALMS race team. FM.net
May - Forzamotorsport.net gets a new face. FM.net
May - FM.net Community forums screenshot - 907 members. Forums
June - Dan Greenawalt photoblogs trip to the 24H of Le Mans. FM.net
July - Forza Motorsport 2 box art revealed. FM.net
Aug - IGN interviews Dan Greenawalt, articles on FM2 progress. FM.net
Sep - TGS and FM2 playable demo at X06 in Barcelona. FM.net
Nov - FM2 development update (will miss Holiday release target). Weekly Pitpass Report v.24
Dec - Photo of Dan Greenawalt asleep at his desk. FM.net
Dec - Forums screenshot - 2,470 members. Forums
2007
Jan - Preview of FM2 scoreboards, car classes, multiplayer. FM.net
Jan 26 - FM2 track list, game release targeted for May 2007. Pitpass
Feb - “The Forza Motorsport Showdown” on SpeedTV. T10 Blogs. FM.net
Feb 27 - Drivatar tech in depth. New Forzamotorsport.net design. FM.net Greenawalt interview with IGN.
Mar - FM2 at GDC. Auction house. Car list to date. FM.net
Apr - T10’s Audio Test Lead triple screen equipment setup. T10 Blog
Apr - Forums screenshot - 10,000 members. Forums
May - Greenawalt interview with IGN.
May 30 - Forza Motorsport 2 officially released. Tournaments. FM.net
Jun - Forums screenshot - 50,000 users. Forums
Jul 10 - E3
Jul - FM2 free Nissan DLC and Peugeot 908. 1Up.com
Aug 19 - FM2 Platinum Hits edition released in the U.S. Announcements Greenawalt interview with Eurogamer.
Aug - Forums screenshot - 75,000 users, half a million posts. Forums
Sep - FM2 DLC. Leaderboard reset. Wikipedia
Oct - FM2 Motegi Track DLC. Greenawalt Q&A with Gamespot. Announcements
Dec - FM2 DLC and Road America Track DLC. Announcements
2008
Feb - Forums screenshot - 100k users. Forums
Mar - FM2 DLC. Announcements
Jul 14 - E3
Sep - Unicorn, Anniversary, and LCE cars. Announcements
2009
Jan - FM.net new white background design. Forums
Apr - Forums screenshot - 160k users. Forums
Jun 2 - E3: Greenawalt and Audi on stage to present FM3. YouTube
Jun - E3 stage demo with Ekberg/Greenawalt/Chou. YouTube
Jun - Forzamotorsport.net new white background. 360 wheel. News
Jul 27 - FM3 LCE and Pre-Order announcement. gamerscoreblog.com
Sep - FM3 goes gold, XBL Demo, themed 360 console bundle. News
Oct 27 - FM3 released. Car List, free DLC, press reviews. News
Nov - Forums stats - 200k users. Forums
Nov - FM3 free Hyundai DLC. New Community Photo Gallery. News
Dec - FM3 DLC. FM3 soundtrack on iTunes. News
Dec - FM3 wins Best Driving Game at Spike awards. Wikipedia
2010
Jan - FM3 DLC. | Forza Motorsport?
Feb - FM3 Nurburgring Track DLC. | Forza Motorsport?
Mar - FM3 DLC. | Forza Motorsport
Apr - FM3 DLC, free MINI DLC. | Forza Motorsport
Jun - FM3 DLC. | Forza Motorsport
Jun 14 - E3: Greenawalt w/Kinect. (at 1:hr21): https://www.youtube.com/watch?v=m4XwMhTHvWI
Jul - FM3 DLC. | Forza Motorsport?
Aug - FM3 Cycled Production Hopper. FM3 Matchmaking Info | Forza Motorsport
Oct - FM3 Ultimate Collection & Top Gear partnership. | Forza Motorsport?
Dec - FM3 DLC. | Forza Motorsport
Dec - FM4 teaser at VGA Awards, scheduled for Fall 2011. Forza Motorsport - Forza Motorsport 4 Announced!
2011
Feb - FM4 vinyl shapes design challenge. Forza Motorsport 4 Community Shapes Challenge | Forza Motorsport
Apr - Forums screenshot - 250k users. https://web.archive.org/web/20110405231400/http://forums.forza.net/forums/default.aspx
May - FM4 Pre-Order details. Forza Motorsport 4 Pre-Order | Forza Motorsport
Jun 3- E3: FM4 unveiled for Oct 11 release. Forza party pic. Forza Motorsport - News
Jun 6 - FM4 at E3: Stage demo with Dan Greenawalt. https://www.youtube.com/watch?v=m5jR8veljQY
Jun - Forzamotorsport.net new dark background design. Forza Motorsport - Welcome to the New FM.net
Jun - FM4 Limited Collectors Edition pre-order. News - Forza
Jul - FM4 Pre-Order Incentives. Forza Motorsport - Forza Motorsport 4 Pre-Order Incentives Program
Jul - FM4 BMW Design Challenge. News - Forza
Jul - Forza Garage FM4 car reveals. Forza Motorsport - Forza Garage: Thursday Car Reveal Roundup
Aug - ALMS 2-yr partnership, Hockenheimring. Forza Motorsport - News
Aug 24 - Under the Hood 1 - Porsche license. Forza Motorsport - Forza Motorsport 4: Under the Hood Part 1
Sep - Under the Hood 2+, Warthog, Infineon, Season Pass. Forza Motorsport - News
Oct - Fanatec, Forza T-shirts, FM4 Demo, BMW M5 Cup. https://web.archive.org/web/20111026051741/http://forzamotorsport.net/en-us/news.aspx
Oct 11 - FM4 released. Reviews. Launch party pics. https://web.archive.org/web/20111026051741/http://forzamotorsport.net/en-us/news.aspx
Nov - FM4 DLC. News
Dec - FM4 DLC. 2011 Year in Review. News
2012
Jan - FM4 DLC, free Veloster Pack, Launch Bonus Pack, VIP gift cars, King of the Track challenges. News
Feb - FM4 ALMS DLC, Bounty rivals, John Schommer joins T10. News
Mar - FM4 DLC, Rear View Mirror, Game With Dev, Track Day. News
Mar 5 - FM4 Porsche Expansion, Forza Horizon announced. News
Mar - Forums screenshot - 300k users. Forums
Apr - FM4 DLC, Heavy Metal Affliction, “Making of FM4” videos. News
May - FM4 DLC, VIP, Porsche Expansion. Unicorn giveaways. Kenan Besirevic joins T10. News
Jun 4 - E3: Forza Horizon trailer shown. (30 min mark) YouTube
Jun - FM4 DLC, free Viper Pack. Forza sponsoring 24H Le Mans. News
Jul - FM4 DLC. Forza Horizon pre-order/bonus. phREDESIGN Community Bounty Hunter taunt video. News
Aug - FM4 DLC. Forza Horizon car reveals. Forza Viper in ALMS. News
Sep - FM4 DLC. Ian Webster joins T10. Forza Horizon Behind the Scenes videos and LCE/VIP pre-order. News
Oct - FM.net redesign. FH demo, SmartGlass experience. News
Oct 23 - Forza Horizon officially released. Season Pass. News
Nov - FH Bondurant Pack. Monthly Bondurant Challenge Rivals. News
Dec - FH DLC and Rally Expansion. 2012 Year in Review. News
2013
Jan - FH DLC, free Honda Challenge Pack. News
Feb - FH DLC, VIP Pack. News
Mar - FH DLC, Pre-Order Car Pack. FM4 ALMS Challenge Rivals. T10 streams 12hrs of Sebring. FM2 servers shutdown. News
Apr - FH DLC and 1000 Club Expansion. News
May - FM5 announced. P1 Ride contest. Robin Stockton joins T10. News
Jun 10 - E3: McLaren P1 and Dan Greenawalt FM5 presentation. YouTube
Jun 11 - Brian Ekberg interviews Dan Greenawalt at E3. Twitch
Jun - Forums screenshot - 350k users. Forums
Jun - FM5 “10 Years in the Making”. FM4 Le Mans lap contest. News
Jul - FM5 at Le Mans and ESPY Awards. Live Challenge/Bacon Suit. Forza Rewards in beta. News
Aug - Forza Rewards. Inside Turn 10. FM5 LE and VIP announced. News
Sep - Xbox V8 Supercar at Bathurst. Forza Filmspeed video. News
Oct - Forza Store and Paddock Pack merchandise. FM5 Bathurst. Audi/Le Mans Vidoc News
Nov 22 - Forza Motorsport 5 launched with Xbox One. Car Pass. News
Dec - Graphical Evolution of Forza Motorsport video RVM
Dec - FM5 Drag/Tag, economy change. 2013 Year in Review. News
2014
Jan - FMC DLC. FM5 Championship of France. WIR
Jan - New Forzamotorsport.net design and forums stats reset. Announcement
Feb - FM5 DLC. Free Honda Pack, design winner. DICE Award. WIR
Feb - FM5 DLC and free Road America track. Announcement
Mar - FM5 DLC. Twitch livestreaming with Xbox One. WIR
Mar - Dan Greenawalt’s “State of the Forza Union” open letter. WIR
Apr - FM5 DLC and free Long Beach track. WIR
May - FM5 DLC. History of Forza 2005-2014 video. Tanner Foust partnership. WIR
Jun - FM5 Bondurant DLC. Forza Road Racing Class - Bondurant. WIR
Jun 2 - IGN reveals FM2 during June. Compiled article and videos: Announcement
Jun 9 - E3: Dan Greenawalt announces Nurburgring for FM5, Ralph Fulton presents Huracan in FH2 coming Sep 30. YouTube
Jun - FM5 DLC and free Nurburgring Expansion. E3 links. WIR
July - FM5 DLC. WIR
Aug - FM5 gets Rolls Royce and Formula E. FH2 at Gamescom. WIR
Sep - FH2 Demo/VIP/Car Pass. Leave Your Limits ad. Forza Fuel. WIR. Announcement
Sep 30 - FH2 officially released on Xbox One and Xbox 360. Announcement
Oct - FH2 DLC. Forza Hub app launched. WIR
Oct - Forza Motorsport Experience coming to the Petersen Museum. WIR
Nov - FH2 DLC and Bucket List 3. WIR
Dec - FH2 DLC and Storm Island Expansion. WIR
Dec - 2014 Year in Review. RVM
2015
Jan - FH2 DLC. FM6 announced with Ford GT. WIR
Feb - FH2 DLC. FH2 Fast & Furious game announced. WIR
Mar - FH2 DLC and free Mazda Pack. WIR WIR
Mar 27 - FH2 Presents Fast & Furious released (free). WIR
Apr - FH2 Furious 7 DLC. Life in the Foust Lane. WIR
May - FH2 DLC and Pre-Order Car Pack. Forza’s 10th Anniversary. WIR
Jun - FH2 DLC. E3 Xbox FanFest tickets and info. FM6 reveal. WIR