Microsoft Corporation (MSFT) has recruited Activision, Inc., (Nasdaq: ATVI) and Infinity Ward to provide prizes for its newest online offensive: Call of Duty® 4: Modern Warfare™ LIVE Fire Weekend 2008, a 72-hour play and win sweepstakes full of games and prizes beginning on Friday, April 18 at 12:01 a.m. EDT through Sunday, April 20 at 11:59 p.m. EDT. Hourly prizes will be awarded throughout the weekend, including Call of Duty 4: Modern Warfare shirts, Infinity Ward autographed posters and Xbox LIVE point cards. One Grand Prize winner also will receive an Infinity Ward autographed Xbox 360 Elite console and a Limited Edition Call of Duty 4: Modern Warfare faceplate, among other items. Players can register now through April 17, 2008 at 11:59 p.m. EDT at www.xbox.com/livefire/.

In addition, on Friday, April 18 from 6-9 p.m. EDT, gamers can play with more than a dozen developers from Infinity Ward and then on Saturday night from 9-11 p.m. EDT Mixed Martial Arts phenom, Jens “Lil Evil” Pulver (gamertag: COD4JensPulver) will join the online action.

Add these gamertags to your friends list: Fourzerotwo COD4Chance COD4Justin COD4Ed COD4David COD4Neel COD4Geoffrey COD4Jon COD4Jeff COD4Drew COD4Ryan COD4Todd COD4Joel

More details on the Call of Duty 4: Modern Warfare LIVE Fire weekend 2008 and information regarding terms, conditions, and official rules are available on the official event page: www.xbox.com/livefire/.

Call of Duty® 4: Modern Warfare™ Game of the Year Edition is now available and allows gamers to experience the intense cinematic action of the original, award-winning and best-selling title, and includes a token for the Call of Duty 4: Modern Warfare Variety Map Pack, available now exclusively for download via Xbox LIVE® Marketplace for the Xbox 360® video game and entertainment system from Microsoft.