: Organizations using volume licenses often use KMS (Key Management Service) , which automates activation through an internal network using a Volume License Pack . Important Security Note
: If you previously purchased Office 2016, you can reinstall it without a key by signing into your account at account.microsoft.com under "Services and Subscriptions". : Organizations using volume licenses often use KMS
: If you have a valid 25-character key, you can link it to your account at office.com/setup. : Organizations using volume licenses often use KMS
: If Office is already installed, you can try finding your key using the Command Prompt (CMD) by running wmic path softwarelicensingservice get OA3xOriginalProductKey as an administrator. : Organizations using volume licenses often use KMS
: Tools like Lazesoft Windows Key Finder can help recover product keys during reinstallation.