In a SIGGraph 2006 presentation by NVIDIA it shows that Microsoft has revisited its stance on how they will support OpenGL within Windows Vista. You may recall when I first wrote about this last year that Microsoft's initial plan was to layer OpenGL through DirectX:

This time last year…

The plan for OpenGL on Windows Vista was to layer OpenGL over Direct3D in
order to obtain the Aeroglass experience

The situation today…

OpenGL accelerated ICD now fully supported under Windows Vista
OpenGL works fully with the Aeroglass compositing desktop
Performance and stability will rival Windows XP by driver release

So it seems some complaining still works given sufficient pressure.