Open Microsoft365.com/setup or Microsoft365.com/setup URL, Sign in, and enter the product key to download and install Microsoft 365 or Office on your computer. microsoft365.com/setup | www.microsoft365/setup, or buy a product key card from a retailer and start a subscription from microsoft365.c0m/setup , Create an account and enter Skype Login credentials to start or host a video call. Skype Logins