Happy with anniversary update
It was actually the first time I was enthusiastic about a Microsoft update, but the anniversary update with the Windows Subsystem for Linux is great as it creates a lot of new possibilities. Now you can really use the power of the Linux commandline and scripting under Windows, which will really boost productivity on the Windows desktop. For me it puts upgrading to Windows 10 higher on the agenda.
Hopefully they'll add built-in X11 support next year!