Go to office.com/setup and sign in with an existing or new copyright and then enter your product key to redeem it*. Redeeming your key is what adds your copyright to Microsoft 365 and you only have to do this once. I received an unsupported operating system message: If https://zertifiziertermicrosoftgo20753.azzablog.com/31147528/top-microsoft-office-geheimnisse