This is how Microsoft ensures that you are using the genuine product and that you purchased the program you are using. Download Original MS Office 2016 ISO? While you may be able to download MS Office 2013 for free, you will not be able to activate and use it without a product key. Office 2016 released on July 9th, 2015 for Mac OS and for Windows OS. Luckily, you can find a free genuine Microsoft Office 2016 product key at you bookmark our we daily post the latest software with crack and keys. But most users cannot afford the software because the price is very high. If you use Office 365, you can easily upgrade to Office 2016 with MS Office 2016. Microsoft Office 2016 is the key that allows you to work with Office 2016 Professional Plus. Microsoft Office 2016 Product key is the latest version of Microsoft Office to follow Microsoft Office 2013.