As Microsoft prepares Windows 8 and Office 2013, the software giant keeps comparing today’s upgrade opportunities to those from 1995, when Windows 95 and Office 95 reshaped the software market. Then Windows NT Server 4.0’s arrival in 1996 created an even bigger Microsoft revenue wave. But here’s the problem: It’s not 1995, and Microsoft should stop comparing the Windows 8-Office 2013 combination to the Windows 95-Office 95 tidal wave. They aren’t the same. Here’s why.