Fix Office Activation After Reinstalling Windows

After reinstalling Windows, Office often loses its activation — even though you already paid. The fix is simple if your license is linked to a Microsoft account.

1. 1Install Office from setup.office.com.
2. 2Open any app and click Sign in.
3. 3Use the account that originally redeemed the key.

1. 1Go to File > Account.
2. 2Click Activate Product and sign in if prompted.
3. 3Office validates the license online and unlocks.

• Check that Windows itself is activated.
• Ensure the date and time are correct.
• Run Office as administrator once.

If the license was not linked to an account, contact our support with your order number — we can help recover it.