How to find Microsoft Office product keys

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Aina Prat Blasi
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What to do if you need to find the Microsoft Office product key. Use a program for find the lost Microsoft Office serial. Most software programs require a product key during the installation process, including all recent versions of Microsoft Office. If you've lost your Microsoft Office product key, you'll need to find it before you can reinstall the software suite.

Microsoft Office product keys are encrypted within the Windows registry, so it's nearly impossible to search for them manually. Once you find the correct registry key, you'll find a string of numbers, but what you'll find is encrypted text, not a working Office product key that you can enter.

Fortunately, programs called key finders do the search and decryption for you, revealing your valid Office product key - that missing puzzle piece so you can successfully reinstall the program.

If you do not find the serial while using one of the methods described below, the only legal option you are left with is to purchase a new copy of MS Office.

Microsoft Office 2022 and 2016 and 2013

Microsoft Office 2022, 2016, and 2013 Product Key search is different from previous Office versions (below).

Unfortunately for us, only the last five characters of the 2022-character Office 2016, Office 2013, or Office 25 product key are stored on your computer, making a key finder virtually useless in this case.

I know, I'll go right back to some of the things I said above! For whatever reason, Microsoft completely changed the way it handled product keys with these newer versions of MS Office

Of course, this unfortunate fact doesn't change the reality that you still need that product key to reinstall both versions.

If you have an installed version of Microsoft Office 2022, 2016, or 2013 through your Office 365 subscription, you don't need to worry about product keys. Log into your account and download and install the latest version of Office on your computer.

It's not bad news that key finder programs are no longer useful with these versions of Office. In fact, the new way Microsoft handles Office serials may not be such a bad thing after all.

  • The 5 best free alternatives to Microsoft Office
  • How to download Microsoft Office 2022?

Microsoft Office 2010 and 2007

Like all versions of Office, Microsoft Office 2010 and Microsoft Office 2007 also require a unique product key during the installation process.

If you are sure that you no longer have the physical product key for your version of Microsoft Office or that you have lost or deleted the email receipt that included the product key inside it, you may, as you read in the introduction above, be in able to extract the key from the registry using a key search tool.

LicenseCrawler, the serial finder program we recommend for Office 2010 and 2007 product keys, will find your product key in seconds.

Most product key search programs below mentioned works well with Microsoft Office 2010 and 2007, such as Magical Jelly Bean Keyfinder, Winkeyfinder, LicenseCrawler and ProduKey.

Earlier versions of Microsoft Office

Earlier versions of Microsoft Office, such as Office 2003 (2003), Office XP (2001), Office 2000 (1999), and Office 97 (1996), also require the Product Key during installation.

Considering how old some of these versions of Microsoft Office are, it would be surprising if anyone still had the serial somewhere.

The Office 2010/2007 tutorial above could also be used for any of these Office versions, but we found that Keyfinder Thing, the serial key finder tool we recommend in this tutorial, does a better job with these older suites.

Further Reading:

  • What is a Product Key? [Where to find it?]
  • What is a CSV file and how to open a .csv file?
  • How to find the Windows 7 product key
  • How to find the Windows XP product key
  • How to find your Windows 8 or 8.1 product key

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