2. Freelancer
Developed by Digital Anvil and headed for a time by former Wing Commander developer, Chris Roberts before he later split from the studio, Freelancer went through some rocky development. Further doubts on its quality were also cast on it due to its focus on a normal mouse and keyboard for control of your craft instead of a joystick, the norm for space sims back then. When it finally did come out though, it quickly turned into a greatly loved title that is still played online now, offering an amazing experience that is unequaled even today.
A sequel was in the works, but for whatever reason, was mysteriously cancelled and Digital Anvil was then shut down and we never heard about the game again from Microsoft. Chris Roberts has since moved on to develop the highly anticipated and incredibly well-funded and utterly massive Star Citizen, once again proving that the demand for a good space sim is still there. But Microsoft's response has once again, just been silence. Stubbornly insisting on doing nothing with this gem.