A Windows Live ID is your e-mail address and a password that you choose. After you’ve signed up for a Windows Live ID, you can use it on Windows Live sites like Windows Live Hotmail, Windows Live Messenger, Office Live, Xbox Live, and more.Microsoft account or MSA (previously known as Microsoft Passport, .NET Passport, Microsoft Passport Network, and Windows Live ID) is a single sign-on web service developed and provided by Microsoft that allows users to log into websites (like Outlook.com), devices (e.g. Windows 10 computers and tablets, Windows Phones.