If you purchased Microsoft Office 2021, 2019, 2016 or 2013 in a box with a disc, or as a product card (digital download) from a retail store, then your Product Key will be with that physical purchase - on the product card, on a sticker, on or in the manual, or on the disc sleeve. Important: The following should work if you're just looking for the Product Key for one member of an Office 2021, 2019, 20 suite, like Word or Excel, as well as if you're after the key for an entire suite, like Office Home & Student, Office Home & Business, or Office Professional in 2021, 2019, 2016 or 2013 versions. Unfortunately, Microsoft changed how they handled Microsoft Office Product Keys beginning with Office 2013, storing only part of the Product Key on your local computer. If you're familiar with Product Keys and how they work, you might assume that the Microsoft Office 2021, 2019, 20 Product Key is stored, encrypted, in the Windows Registry, like older versions of Office and most other programs do. You've probably already tried all the expected 'looking around' but there are a few more things you can try that you may not have known about.

So what do you do if you need to reinstall the program but you've lost this important, 25-digit installation code?

Microsoft Office 2021, 2019, 20, like all versions of Office and most other programs you pay for, requires that you enter a unique Product Key during the installation process, proving, to a point, that you own the software.

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