It's an add on, from Avsim right now, called Vista Australis...

The clouds, atmosphere, landclass, autogen, textures...and some scenery areas like Melbourne, are all non-default. The mesh is also a downloaded add on. In fact, very little which is visible is default FS9...
...but the code whirring away in the background which makes it all work and allows so many add-ons to funtion is MS, thank you MS!!! :)
If you're bored of an evening - and you'll have to be - you can check out my screenshot gallery: Kriglsflightsimscreens
...HERE[center][img]http://www.simviation.com/phpup