Whether you run a small business or a single home computer, losing a Windows or Office product key is a common and avoidable problem. A key that you cannot find forces you to buy again, or to spend hours with support after a reinstall. This guide shows simple ways to organize and store your Windows and Office license keys, and what to keep so you can prove that your software is properly licensed.
What to save for every license
- The product name and version, for example Windows 11 Pro or Office 2024 Professional Plus.
- The 25-character product key.
- The order number and the purchase date.
- The email address or Microsoft account linked to the license, if any.
- The computer where the license is installed.
- A screenshot of the activation page after you activate.
Where to store your keys safely
Keep your keys in one place that you control and that is protected by a strong password. A password manager is the best choice, because it encrypts your data and lets you attach notes and files. An encrypted folder or a password-protected spreadsheet also works. Avoid leaving keys in plain text on the desktop, in shared documents or in a public cloud folder, since anyone who finds a key can use it.
Also keep the original delivery email. Most sellers, including us, send your key and order details by email, and that message is your proof of purchase.
Link your licenses to your Microsoft account
On Windows 10 and Windows 11, you can link your digital license to your Microsoft account in Settings, System, Activation. This makes it easier to reactivate after a hardware change. For Office, redeeming your key with your Microsoft account makes reinstalling simpler, because you can sign in and download the software again.
Keep a simple inventory (especially for businesses)
If you manage several computers, keep a spreadsheet with one line per license. Include the software, the key (or a pointer to where it is stored), the computer, the user, the purchase date and the version. Review it once or twice a year to spot software that is no longer in use, and to check support dates. For example, Microsoft ended support for Windows 10 in October 2025 and for Office 2021 in October 2026, so these machines may need a plan.
Respect the license terms
Retail one-time licenses are designed for one computer at a time. Do not install the same key on several machines, and remove the software from the old computer before you move a license to a new one. Our guide on transferring an Office license explains the steps.
What if you lost a key?
Search your email for the original delivery message and check your customer account on our site. If you cannot find it, contact support with your order number. Our Shipping Policy explains how keys are delivered, and our Refund Policy covers cases where a key does not work.
Need a new license? Browse Windows 11 Pro and Office 2024 Professional Plus.