For reasons only known to Steve Ballmer, Redmond decided to kill off games like Solitaire, Minesweeper, and Hearts from Windows 8. For many users this was a feature which they could not live without, and forced them to stick to Windows 7.
Overhauled and modern versions were available in the Windows Store, but PC user did not bother to look there because that was part of the tablet function of Windows 8 which serious users never looked at.
According to the Verge Microsoft is now bringing back Solitaire as a built-in game on Windows 10. It will be the modern version from Windows 8, but you no longer have to search around the Windows Store to find it and play.
Only Solitaire is back as a built-in app so far, and that may even change by the time Windows 10 ships in the summer.Who knows, perhaps they will also put the flight sim back into Excel.