If you bought Microsoft Office a product key come with package, You Need product key for Install Office or renew your subscription of Office 365. Microsoft office product key is a combination of 25 letters and number.
Product key look like this
How to get product key depends on how you purchase Microsoft office Subscription. Below are some options how to get Microsoft Office.
If you already installed Microsoft Office and want to see your Microsoft product key. First step Open your account which is associated with your Office install by Word 2016, PowerPoint 2016, or Excel 2016 and going to File:(Microsoft Office Button) > Account. Find the Email address which is belonging to product. Now you can reinstall Office from http://www.office.com/myaccount with the use of that email account, no need of product key here.
Seeing your full product key on http://www.office.com/myaccount works just for the 2013 and 2016 Version of the following product:
Office Home and Business
Office Home and Student
Here’s the manner by which you can see your product key on the www.office.com/myaccount page:
Go to office.com/myaccount, and select Install from a Disc. Now select I have a Disc, and select View your Product key.