When you sign in to your Microsoft account, you have an all-access pass to Microsoft's premier services. If you use any of these services, you should already have a Microsoft account: Outlook.com, Office, Skype, OneDrive, Xbox Live, Bing, Microsoft Store, Windows, or MSN.
Your Microsoft account lets you manage everything all in one place. Keep tabs on your subscriptions and order history, organize your family's digital life, update your privacy and security settings, track the health and safety of your devices, and get rewards.
Everything stays with you in the cloud and across devices, including iOS and Android. Get to the people, content, and entertainment that matter to you most, with your Microsoft account. One account, all things Microsoft.