Office 2016 is designed to help you create and organize faster with time-saving features, a new modern look, and built-in collaboration tools. Plus, you can save your documents in the cloud on OneDrive and access them from anywhere.
The Home and Student license is a perpetual license that is allowed to be installed and used on computer. If you get a new computer, you will have to deregister the old and one register the new one. If for some reason you can’t do that, you will need to call Microsoft support and have them do it for you. You will need the original sales receipt to do that so I would hang onto that.
Product keys are forever. You bought it, you own it. But at some point, typically about three generations out, Microsoft will stop supporting it in favor of newer versions, if they haven’t moved everything to the monthly subscriber model (Office 365) by then.
Your only other possible limitation is hardware; at some point in the future, you might buy a computer that’s just too sophisticated for your “old” 2016 software to run on.
You can buy Office Home & Student 2016 CD Key at http://www.onlinekeybuy.com/office-2016-c-23.html