Another Real Time Strategy Game from Microsoft. 

Rise of Nations is a historical real time strategy game from Big Huge Games (Owned by MS?) Brian Reynolds, designer of PC game classics such as Civilization 2 and Alpha Centauri.

In Rise of Nations, you'll create new cities, improve city infrastructures and expand national borders. Conquer foes through military might using everything from sling-shots to cannons to stealth bombers to nuclear weapons; corner the market on key commodities and consolidate power under your rule; wheel and deal across time with history's eminent cultures.