Originally found @ Rage3D:
I contacted Terry Makedon, ATI's software product manager to see if this was true. He has said the following:
The story on Warp2Search is not true. Microsoft has not contacted me about any incompatibility with DirectX 9.0a and CATALYST 3.1. I also find it interesting that the news story also claims that CATALYST 3.1 perform better than CATALYST 3.2 (another inaccuracy). It is a false story, do not believe it. I will be contacting the author of the story for more information.