Thanks John for the reply,
My Current servers are on windows 2008 and I want to transfer them to Windows 2016 for better functionality. Because we will be having some application which will be supported on Windows 2016.
Regarding template upgrade , just want to be more sure. anything bad should not happen because there are lot of applications which are dependent on address book.Later we will develop plan for the same.
I will go through this cookbook and will come back to you . If there is any difficulty.