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Q: What is a product key, and why do I need it? A: A product key is a 25-character code used to activate Microsoft Office 15. You need it to verify that your software is genuine and to access all the features.

Used by enterprises, schools, and large organizations. These utilize Key Management Service (KMS) or Multiple Activation Key (MAK) architecture to manage deployment across hundreds or thousands of workstations.

Restart Word or Excel to see if the activation prompt has disappeared. 2. Verify and Re-Enter Your Product Key

A highly powerful, community-driven suite featuring Writer, Calc, and Impress.

. If your license is linked to your Microsoft account, it should activate automatically upon signing in. Manual Key Entry : If you have a physical or digital product key, select "Enter a product key instead"

Go to Control Panel > Programs and Features > Select Microsoft Office 2013 > Change > Quick Repair . 5. Free Alternatives & Moving Beyond Office 15

If you have the Click-to-Run version (streaming installation), you can force an update via Command Prompt to a stable version that resolves activation glitches.

Microsoft Office 15, widely known as Microsoft Office 2013, remains a staple for many users who prefer one-time purchase software over modern subscription models. However, as of 2026, users may encounter "Unlicensed Product" or "Activation Required" prompts, even on legitimately purchased versions, due to outdated activation servers or system changes.

Whether you have the retail version (Home & Student, Home & Business) or the volume-licensed version (Pro Plus), the following fixes are universal, though specific steps may vary slightly based on the installation method (MSI vs. Click-to-Run).

. If you are looking for activation solutions, it is critical to note that official support for this version ended on April 11, 2023 JustAnswer Official Activation Methods

If you need a legitimate solution, choose one of these lawful options: