Microsoft 365 or Office on your computer. If you are using any other Microsoft service such as OneDrive, Outlook, Skype, or Xbox Live, it means you already have an account that you can use for any Microsoft activity. Microsoft365.com/setup
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To redeem a new purchase.
Step 1: Go to www.office.com/setup or Microsoft365.com/setup.
Step 2: Sign in with your Microsoft account, or create one if you don't have one. ...
Step 3: Enter your product key, without hyphens, if prompted.