Confirming what we already knew, today Microsoft announced they are acquiring Yammer for $1.2 billion in cold cash. Here's a blog post by David Sacks , the CEO of Yammer. Microsoft doesn't report a revenue breakdown for their individual products but SharePoint is believed to be one of the fastest growing products with annual revenue of more than $1 billion. Regardless of how Microsoft markets and positions SharePoint, it has always been collaboration software and not really social software. Microsoft does seem to understand the challenges it faces in moving their portfolio of products to the cloud, including SharePoint. Microsoft also understands value of having end users on their side even though SharePoint is sold as enterprise software. Microsoft's challenges in transitioning to the cloud are similar to the ones faced by other on-premise enterprise software vendors. But, I really admire Microsoft's commitment by not giving up on any of these things. Skype's acq