From 15 systems running Windows 7 (and a few 8’s) and 1 Linux box and 1 OS X laptop.
To 9 systems running Windows and 7 Linux boxes and 1 OS X laptop by July.
To a planned 2 systems running Windows (because we cannot change the OS) to everything else OS X and Linux by end-of-the-year.
Because Windows 10 happened.
Or rather, because Microsoft decided that I should upgrade because they said so.
Imagine purchasing a loaf of bread and then being told by the baker whether you can make toast or not.