An example of a Microsoft account sign-in page
|Slogan||Your account, our priority|
Microsoft account (previously Microsoft Wallet, Microsoft Passport, .NET Passport, Microsoft Passport Network, and most recently Windows Live ID) is a single sign-on web service developed and provided by Microsoft that allows users to log into many websites using one account.
Microsoft account allows users to sign into websites that support this service using a single set of credentials. Users' credentials are not checked by Microsoft account-enabled websites, but by a Microsoft account authentication server. A new user signing into a Microsoft account-enabled website is first redirected to the nearest authentication server, which asks for username and password over an SSL connection. User may select to have their computer remember their login: A newly signed-in user has an encrypted time-limited cookie stored on their computer and receives a triple DES encrypted ID-tag that previously has been agreed upon between the authentication server and the Microsoft account-enabled website. This ID-tag is then sent to the website, upon which the website plants another encrypted HTTP cookie in the user’s computer, also time-limited. As long as these cookies are valid, the user is not required to supply a username and password. If the user actively logs out of their Microsoft account, these cookies will be removed.
Microsoft account offers a user two different methods for creating an account:
- Use an existing e-mail address: Users are able to use their own valid e-mail address to sign up for a Microsoft account. The service turns the requesting user's e-mail address into a Microsoft account. User may also choose a password of their own choice.
- Sign up for a Microsoft e-mail address: Users can also sign up for an e-mail account with Microsoft's webmail services designated domains (i.e. @hotmail.com, @live.com, @msn.com, @passport.com and @outlook.com or any variant for a specific country) that can be used as a Microsoft account to sign into other Microsoft account-enabled websites.
Microsoft sites, services, and properties such as Windows Live, MSN, Xbox LIVE, Zune, Windows Phone, and Windows 8 use Microsoft account as a mean of identifying users. There are also several other companies that use it, such as the Hoyts website which is hosted by NineMSN.
Windows XP and later has an option to link a Windows user account with a Microsoft account, thus automatically logging users into Microsoft account whenever a service is accessed. Windows 8 also allow users to directly authenticate into their PCs using their Microsoft account, rather than a local or domain user.
Web authentication 
On August 15, 2007, Microsoft released the Windows Live ID Web Authentication SDK, enabling web developers to integrate Windows Live ID into their websites running on a broad range of web server platforms - including ASP.NET (C#), Java, Perl, PHP, Python and Ruby.
Support for Windows CardSpace 
The Windows Live ID login page presents users with the alternative to sign in using Windows CardSpace instead of the usual username and password combination. Windows Live ID account owners can enable integration with Windows CardSpace (a component of the .NET Framework versions 3.0 and 3.5) by selecting an Information Card from the Windows CardSpace selector UI to link to their Windows Live ID. This CardSpace identity then becomes the alternate login credentials for that account, replacing the need for a password.
Support for OpenID 
On October 27, 2008, Microsoft announced that it was publicly committed to supporting the OpenID framework, with Windows Live ID becoming an OpenID provider. This would allow users to use their Windows Live ID to sign-in to any website that supports OpenID authentication. There has been no update on Microsoft's planned implementation of OpenID since August 2009.
Microsoft account is the website for users to manage their identity. Features of a Microsoft account include:
- updating user's information such as first and last names, address, etc. associated with the account;
- updating user settings, such as preferred language or preferences for email communications;
- changing or resetting user passwords;
- close the account;
- view billing details associated with the account;
- link multiple Microsoft account IDs together.
Security vulnerability 
On June 17, 2007, Erik Duindam, a web developer in the Netherlands reported a privacy and identity risk, saying a "critical error was made by Microsoft programmers that allows everyone to create an ID for virtually any e-mail address." A procedure was found to allow users to register invalid or currently used e-mail addresses. Upon registration with a valid e-mail address, an e-mail verification link is sent to the user. Before using it however, the user was allowed to change the e-mail address to one that doesn't exist, or to an e-mail address currently used by someone else. The verification link then caused the Windows Live ID system to confirm the account as having a verified email address. That flaw was fixed two days later, on June 19, 2007.
On April 20, 2012, Microsoft fixed a flaw in Hotmail's password reset system that allowed anyone to reset the password of any Hotmail account. The company was notified of the flaw by researchers at Vulnerability Lab on the same day and responded with a fix within hours — but not before widespread attacks as the exploitation technique spread quickly across the Internet.
Microsoft Passport, the predecessor to Windows Live ID, was originally positioned as a single sign-on service for all web commerce. Microsoft Passport had received much criticism. A prominent critic was Kim Cameron, the author of the Laws of Identity, who questioned Microsoft Passport in its violations of those laws. He has since become Microsoft's Chief Identity Architect and helped address those violations in the design of the Windows Live ID identity meta-system. As a consequence, Windows Live ID is not positioned as the single sign-on service for all web commerce, but as one choice of many among identity systems.
In December 1999, Microsoft neglected to pay their annual $35 "passport.com" domain registration fee to Network Solutions. The oversight made Hotmail, which used the site for authentication, unavailable on Christmas Eve, December 24. A Linux consultant, Michael Chaney, paid it the next day (Christmas), hoping it would solve this issue with the downed site. The payment resulted in the site being available the next morning. In Autumn 2003, a similar good Samaritan helped Microsoft when they missed payment on the "hotmail.co.uk" address, although no downtime resulted.
In 2001, the Electronic Frontier Foundation's staff attorney Deborah Pierce criticized Microsoft Passport as a potential threat to privacy after it was revealed that Microsoft would have full access to and usage of customer information. The privacy terms were quickly updated by Microsoft to allay customers' fears.
In July and August 2001, the Electronic Privacy Information Center and a coalition of fourteen leading consumer groups filed complaints with the Federal Trade Commission (FTC) alleging that the Microsoft Passport system violated Section 5 of the Federal Trade Commission Act (FTCA), which prohibits unfair or deceptive practices in trade.
In 2003, Faisal Danka, a British IT Security expert, revealed a serious flaw in Microsoft Passport, through which any account linked to Microsoft Passport or Hotmail could easily be cracked by using any common browser.
Microsoft had pushed for non-Microsoft entities to create an Internet-wide unified-login system. Examples of sites that used Microsoft Passport were eBay and Monster.com, but in 2004 those agreements were cancelled. In August 2009, Expedia sent notice out stating they no longer support Microsoft Passport / Windows Live ID.
See also 
- Identity management
- Identity management system
- Single sign-on
- List of single sign-on implementations
- Other identity services
- Identity management
- Microsoft Passport: Streamlining Commerce and Communication on the Web
- LiveSide.net: Windows Live ID Web Authentication Is Final 2007-07-16
- Live ID Team blog announcement: Windows Live ID Web Authentication SDK for Developers Is Released 2007-07-15
- LiveSide.net: CardSpace (InfoCard) and Live ID 2007-07-02
- Windows Live ID Becomes an OpenID Provider
- Windows Live ID OpenID Status Update
- http://www.erikduindam.com/windowslive.pdf "Windows Live ID security breached" on erikduindam.com
- Microsoft Windows Live Flaw Opened Door to Scammers
- Microsoft MSN Hotmail - Password Reset & Setup Vulnerability
- Twitter / @msftsecresponse: On Friday we addressed a reset function incident to help protect Hotmail customers, no action needed
- Bright, Peter (April 27, 2012). "Microsoft patches major Hotmail 0-day flaw after apparently widespread exploitation". Ars Technica. Archived from the original on October 21, 2012. Retrieved October 21, 2012.
- Chaney, Michael (2000-01-27). "The Passport Payment". Retrieved 2007-11-03.
- Richardson, Tim (2003-11-06). "Microsoft forgets to renew hotmail". The Register. Retrieved 2007-11-03.
- Privacy terms revised for Microsoft Passport
- EPIC: Microsoft Passport Investigation Docket, http://epic.org/privacy/consumer/microsoft/passport.html
- Faisal Danka
- Microsoft Passport Dumped By Ebay
- Windows 8 Consumer Preview - FAQ
- "What is a Microsoft account?". Microsoft. Retrieved 2 August 2012. "Microsoft account" is the new name for what used to be called a "Windows Live ID."
Further reading 
- Creating a Windows Live ID Account
- Introduction to Windows Live ID whitepaper — Provides a brief overview of the Windows Live ID service in the context of Microsoft's overall identity strategy.
- Understanding Windows Live Delegated Authentication whitepaper — Describes how a Web site can use the Windows Live ID Delegated Authentication system to get permission to access users' information on Windows Live services.
- Windows Live ID Federation whitepaper — Describes the concept of identity federation and offers considerable detail about how the Windows Live ID service supports it.
- Official website
- Windows Live Sign In Help Center
- Windows Live Developers Portal
- Windows Live ID on mobile devices