To use any Microsoft services, you need to create a Microsoft account—an email address and password that you use to sign in to all Microsoft sites and services, including Outlook.com, Hotmail, Messenger, and SkyDrive. A Microsoft account also gets you into other Microsoft sites such as Xbox LIVE, Zune, and Office Live.
You can create a new Microsoft account at Outlook.com, or you can use an address you already have as your Microsoft account.