In Windows Server 2012 R2 and Windows 8.1, Microsoft has released a combination of operating system updates that we find very compelling. Microsoft has joined much of the rest of the industry in annual release roll-ups with feature additions, and this time, they listened to the critics. More interesting are the one-upmanship features targeted directly at its virtualization and cloud competition. Some were stunning, despite a few strange and perhaps anecdotal basic problems that we found.