: 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 (Key Management Service) , which automates activation through an internal network using a Volume License Pack . Important Security Note : If Office is already installed, you can
: If you have a valid 25-character key, you can link it to your account at office.com/setup. : If Office is already installed