Microsoft to (Finally) Acquire Powerset? Should Someone Tell Icahn?

Microsoft must have been putting on a good poker face a week ago when it said they weren't looking at any internet-based acquisitions in the wake of failed talks with Yahoo. Venture Beat is now reporting that Microsoft is poised to acquire semantic search company Powerset in the neighborhood of $100 million.

Meanwhile, Carl Icahn is still living his proxy dreams. He's calling on Microsoft to not make an alternative deal with Yahoo unless a $33 per share guarantee is in place, according to Reuters.

The question is: Which of Microsoft's bluffs should we call? The one where they said they weren't interested in acquisitions? Or the one where they're buying Powerset (to once again put pressure on Yahoo)?

Call bluffs in the comments!