Gates also predicted that the Xbox 360 platform will be backed up by more than 160 games by the end of the year.
Speaking at the Electronic Entertainment Expo this week, Gates also described a plan to clear the way for cross-platform gameplay, with participants using Windows-based PCs, mobile phones and Xbox 360 consoles to play together simultaneously.
By this time next year, Microsoft expects to have more than six million gamers connected to the Xbox Live network.
Gamers will have the ability to connect to the Xbox Live world from their Windows-based PCs early next year, with one identity, one friends list, one set of achievements and voice communications across all games on the network.
Microsoft will also be introducing the Xbox 360 to seven new countries in the coming year with launches in Chile, the Czech Republic, Hungary, India, Poland, Slovakia and South Africa.
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