MS Office My Account is a lone account where users can access a chunk of their Microsoft apps. All they need is one account, and they can video call their loved ones over Skype, save their pictures on OneDrive, check out their badges on Xbox, etc. Earlier, it was called Windows Live ID. To access MS Office subscriptions, services, etc., one needs to login using their Microsoft account username and password. You can download Microsoft Office setup by logging into your account.