Hello Flight Sim Fans,

The Microsoft ACES team released service pack 2 for Flight Simulator X. SP2 features many improvements across the board including support for DX10 hardware.
Flight Simulator X Service Pack 2 previews the new technology of DirectX 10 to enhance environmental effects such as bloom, realistic water, and virtual cockpit shadowing. You must have a DirectX 10 graphics adapter to enable the DirectX 10 features (the check box for DirectX 10 is not visible if you don't have compatible hardware).

Download SP2 from here:
http://www.fsinsider.com/downloads/Pages/FlightSimulatorXServicePack2.aspx

More details here:
http://www.fsinsider.com/downloads/Pages/SP2-EN-ReadMe.aspx

ps: You must install Service Pack 1 before installing Service Pack 2.