With market penetration of well over 100 million seats, SharePoint is a strategic investment for many organizations. For most, the primary goal of that investment is more effective collaboration among knowledge workers. And while returns on SharePoint are positive for most, there is room for improvement. Two key faults of SharePoint are user adoption and enterprise social functionality. Microsoft's $1.2 billion acquisition of Yammer in 2012 appears to be the perfect solution to address SharePoint's main challenges — but only for those users who can move critical workloads, at least in part, to the cloud.