Why good things are always acquired by douchebag companies and ruined to the ground? First Java, now this.
First, I'd repeat the observation made by many that Revolution Analystics doesn't own R; it simply provides commercial support.
As an R user in business, this seems like good news. Microsoft has been promoting R for some time as an analytic layer to sit over its databases, but people in business are a conservative bunch. I've spoken to many associates in other businesses, and the main reasons that they prefer to continue with SAS is that support, training and consultancy are far more readily available for SAS than R. 'Supported by Microsoft' is a label that may persuade some to shift, especially if it's supported by a genuine expansion of commercial R support.