Updating o/s on same server

[Ish]

Hi

We have a SBS2011 server but we no longer use Exchange as we have Office 365.

Our desktops are also now all W10.

What is the easiest way of installing Server 2012/2016 on our existing SBS2008 server with the least amount of downtime?

 

[Ish]

Thanks for the tips. Will have a rethink on how we implement this.