What the Official Microsoft Site Says
Now on first look at the Microsoft Windows 8 Compatibility Center website, it appears that Microsoft Flight Simulator X: Acceleration is compatible with both Windows 8 and 8.1. The same goes for Microsoft Flight Simulator X (v10) Standard Edition, Gold Edition (which includes Acceleration) and Flight Simulator 2004 (v9). However, the Deluxe Edition of FSX is displayed as "Not Compatible" over at the official site. We're not quite sure why this is shown (or whether it's true/accurate). See the image below for an example (please click on the image for the full compatibility chart):
What Users are Saying
Most users are reporting no problems at all with compatibility, while others are reporting problems with installation, running and using FSX and FS2004. We can't pinpoint specific reasons for problems yet. We'd love to know in the comments below. Some users are reporting problems with FSX crashing while running.
Fixing Error 1722
Lots of users are reporting "Error 1722" when attempting to re-install Flight Simulator X on their upgraded or freshly installed Windows 8 operating system.
This error usually appears when you remove Flight Simulator X from your computer and attempt to re-install it. However, some users are reporting this error on a fresh install - which is strange. The error usually means that the Software Licensing System has to be reset.
Microsoft have issued a fix for this bug and it involves simply running an .exe file that they have packaged.
You can download the tool and view additional instructions on how to fix it over at the Microsoft site here.
Upgrade to Windows 8.1
Many users are reporting that after upgrading to v8.1 of Windows, most of their errors and issues running several games and programs (including Flight Simulator X) have improved. It might be worth upgrading to 8.1 to see if your problems disappear or improve before downgrading to Windows 7 (or lower).
It's essential that we find ways to ensure compatibility with the latest versions of Windows being released. Either Microsoft will need to ensure compatibility or users will have to take it in their own hands to release patches and fixes. As Microsoft have no plans to release a full flight simulation package any time soon, we really need to keep FSX and FS2004 running in any of the new Windows releases (now and future).
Let us Know What Works for You
Please make full use of the comments below. Let us know if you're running either FSX or FS2004 successfully on Windows 8, if you had any bugs or errors installing or running and what you did to fix them. The more comments we get below, the more we can help the members of our community continue running the flight simulators they love.