Screenshot of Outlook.com inbox with open Skype window
Type of site
|Available in||106 languages|
|Users||420 million (18 February 2013)|
|492 (March 2015[update])|
Outlook.com is a free web-based email service run by Microsoft. One of the world's first webmail services, it was founded in 1996 as Hotmail (stylized as HoTMaiL) by Sabeer Bhatia and Jack Smith in Mountain View, California, and headquartered in Sunnyvale. Hotmail was acquired by Microsoft in 1997 for an estimated $400 million and launched as MSN Hotmail, later rebranded to Windows Live Hotmail as part of the Windows Live suite of products. The last version of Hotmail was released in October 2011. As of mid-2011, Hotmail had 360 million users per month. It was available in 36 languages. In 2013, Hotmail was replaced with Outlook.com, which features Microsoft's Metro design language, and closely mimics the interface of Microsoft Outlook. It also features unlimited storage, Ajax, and integration with Calendar, OneDrive, People and Skype.
- 1 History
- 2 Features
- 3 Mail client access
- 4 Controversy
- 5 See also
- 6 References
- 7 External links
Launch of Hotmail
Hotmail service was founded by Sabeer Bhatia and Jack Smith, and was one of the first webmail services on the Internet along with Four11's RocketMail (later Yahoo! Mail). It was commercially launched on July 4, 1996, symbolizing "freedom" from ISP-based email and the ability to access a user's inbox from anywhere in the world. The name "Hotmail" was chosen out of many possibilities ending in "-mail" as it included the letters HTML, the markup language used to create web pages (to emphasize this, the original type casing was "HoTMaiL"). The limit for free storage was 2 MB. Hotmail was initially backed by venture capital firm Draper Fisher Jurvetson. By December 1997, it reported more than 8.5 million subscribers. Hotmail initially ran under Solaris for mail services and Apache on FreeBSD for web services, before being partly converted to Microsoft products, using Windows Services for UNIX in the migration path.
Hotmail was sold to Microsoft in December 1997 for a reported $400 million, and it joined the MSN group of services. Hotmail quickly gained in popularity as it was localized for different markets around the globe, and became the world's largest webmail service with more than 30 million active members reported by February 1999. Hotmail originally ran on a mixture of FreeBSD and Solaris operating systems. A project was started to move Hotmail to Windows 2000. In June 2001, Microsoft claimed this had been completed; a few days later they retracted and admitted that the DNS functions of the Hotmail system were still reliant on FreeBSD. In 2002 Hotmail still ran its infrastructure on UNIX servers, merely the front-end was converted to Windows 2000. Later development saw the service tied with Microsoft's web authentication scheme, Microsoft Passport (now Microsoft account), and integration with Microsoft's instant messaging and social networking programs, MSN Messenger and MSN Spaces (now Windows Live Messenger and Windows Live Spaces, respectively).
In 1999, hackers revealed a security flaw in Hotmail that permitted anybody to log into any Hotmail account using the password 'eh'. At the time it was called "the most widespread security incident in the history of the Web". In 2001, the Hotmail service was compromised again by computer hackers who discovered that anyone could log into their Hotmail account and then pull messages from any other Hotmail account by crafting a URL with the second account's username and a valid message number. It was such a simple attack that by the time the patch was made, dozens of newspapers and hundreds of web sites published exact descriptions allowing tens of thousands of hackers to run rampant across Hotmail. The exploitable vulnerability exposed millions of accounts to tampering between August 7, 2001 and August 31, 2001.
In 2004, Google announced its own mail service, Gmail. Featuring greater storage space, speed, and interface flexibility, this new competitor spurred a wave of innovation in webmail. The main industry heavyweights – Hotmail and Yahoo! Mail – introduced upgraded versions of their email services with greater speed, security, and advanced features.
Windows Live Hotmail
Microsoft's new email system was announced on November 1, 2005, under the codename "Kahuna", and a beta version was released to a few thousand testers. Other webmail enthusiasts also wanting to try the beta version could request an invitation granting access. The new service was built from scratch and emphasized three main concepts of being "faster, simpler, and safer". New versions of the beta service were rolled out over the development period, and by the end of 2006 the number of beta testers had reached the millions.
The Hotmail brand was planned to be phased-out when Microsoft announced that the new mail system would be called Windows Live Mail, but the developers soon backtracked after beta-testers were confused with the name change and preferred the already well-known Hotmail name, and decided on Windows Live Hotmail. After a period of beta testing, it was officially released to new and existing users in the Netherlands on November 9, 2006, as a pilot market. Development of the beta was finished in April 2007, Windows Live Hotmail was released to new registrations on May 7, 2007, as the 260 million MSN Hotmail accounts worldwide gained access to the new system. The old MSN Hotmail interface was accessible only by users who registered before the Windows Live Hotmail release date and had not chosen to update to the new service. The roll-out to all existing users was completed in October 2007.
In 2008 it was announced that the service would be updated with focus on improving the speed, increasing the storage space, better user experience and usability features, and that sign-in and email access speeds would be up to 70 percent faster. The classic and full versions of Windows Live Hotmail were combined in the new release. As a result of user feedback, Hotmail was updated so that scrolling works for users who have the reading pane turned off. It was also expected that Hotmail team would be moving the advertisement from the top of page to the side, adding more themes, increasing the number of messages on each page and adding the ability to send instant messages from the user's inbox in future releases.
Support for Firefox in the upgraded Windows Live Hotmail took a few months to complete. By 2009, support for Google Chrome was still incomplete, prompting the Chrome developers to temporarily ship a browser that employed user agent spoofing when making requests to the Windows Live site.
As part of the update, Microsoft also added integrated capability for instant messaging with contacts on the Windows Live Messenger service. The feature is the realization of a project that began as "Windows Live Web Messenger" in 2007, a replacement for the outdated "MSN Web Messenger" service that was first launched in August 2004. It was noted that the original "Windows Live Web Messenger" featured tabbed conversations in a "conversation workspace", however since its integration with Hotmail this has been removed.
On May 18, 2010, Microsoft unveiled the "Wave 4" update of Hotmail, which offered features such as 1-click filters, active views, inbox sweeping, and 10 GB space for photos, Microsoft Office documents, and attachments. It also included integration with Windows Live SkyDrive and Windows Live Office, a free version of Microsoft's Office Web Apps suite. The new version began its gradual release to all Hotmail users on June 15, 2010 and was completely rolled out on August 3, 2010. Exchange ActiveSync support was enabled to all Hotmail users on August 30, 2010, allowing users to sync their mail, contacts, calendar and tasks to their mobile devices that supports the protocol. Addition of full-session SSL was released on November 9, 2010.
Throughout 2011, Microsoft added several new features to Hotmail, such as aliases and speed improvements. In October 2011, Microsoft unveiled a "re-invented Hotmail", and added many new features such as Instant Actions, scheduled Sweep, and Categories and this update began fully rolling out on November 9, 2011. This update also made SSL enabled by default on all accounts.
Transition to Outlook.com
Outlook.com was first introduced on 31 July 2012 when its beta version was made available to the general public. Existing Hotmail customers could freely upgrade to the preview version of Outlook.com and downgrade back.
Outlook.com graduated preview stage on 18 February 2013. According to Microsoft, the upgrade was deployed on April 3, 2013; the user kept their existing Hotmail accounts and received the option of having an @outlook.com email address.
As of May 2013, Outlook.com had 400 million active users.
Outlook on the web
In May 2015, Microsoft announced it would move the service over to what it described as an "Office 365 based infrastructure". This was followed in June 2015 by the introduction through an opt-in preview of new features, including new calendar layout options, a filtering service called "Clutter" and new theme designs.
Similar to other major webmail services, Outlook.com uses Ajax programming techniques and supports later versions of Internet Explorer, Firefox, Safari, and Google Chrome. Some of its features include keyboard controls giving the ability to navigate around the page without using the mouse, the ability to search the user's messages including structured query syntax such as "from:ebay", message filters, folder-based organization of messages, auto-completion of contact addresses when composing, contact grouping, importing and exporting of contacts as CSV files, rich text formatting, rich text signatures, spam filtering and virus scanning, support for multiple addresses, and different language versions.
Outlook.com has promised to respect user's privacy, specifically targeting Gmail's privacy practices. Outlook.com does not scan emails or attachments for advertising information and personal conversations are ad-free entirely.
In March 2014, when former Microsoft employee Alex Kibkalo was arrested for his involvement in 2012 leaking of Microsoft's trade secrets, Microsoft came under criticism for having accessed the email inbox of his French accomplice. Critics claim these actions violate privacy laws as well as Microsoft's own promises with regards to users' personal information, while others have pointed out that such access is permitted under Microsoft's privacy policies in order to "protect the rights or property of Microsoft", that it was necessary in order to prevent a crime intended to have inflicted billions of dollars of damage, and that such action on Microsoft part is unprecedented in 18 years. In response to the criticism, Microsoft has announced that it would no longer access private account information themselves in such cases, but would instead hand the investigation over to law enforcement agencies.
Outlook.com's Active View allows users to interact directly with contents and functionality within their email message. For example, any photo attachments can be previewed directly using Active View. In addition, Outlook.com provides a partner platform which allows contents and functionality from various websites and services such as YouTube, Flickr, LinkedIn, and United States Postal Service to be viewed directly within the email message. For example, users may view the YouTube video within Outlook.com when a user receives an email which contains a link to the video. Other Active View features include tracking of real time shipping status from United States Postal Service and performing social networking actions on LinkedIn or other social networking sites directly from within the email message.
Office Online integration
Outlook.com integrates with Office Online to allow viewing and editing of Microsoft Word, Excel and PowerPoint documents that are attached to the email messages. Users can directly open attached Office documents within the web browser, and save them into their OneDrive. Users can also perform edits to any received Office documents, and directly reply to the sender with the edited version of the document. In addition, users may also send up to 25 GB of Office documents (up to 50 MB each) using Outlook.com by uploading these documents onto OneDrive, and share these documents with other users for viewing or collaboration.
A preview version of Skype for Outlook.com started rolling out in the UK on April 30. This feature allows users to make a Skype video call within Outlook.com without using the Skype desktop client.
Outlook.com offers a "virtual broom" which allow users to delete or move large amounts of emails into specified folders based on the sender's information. Once a "sweep" is performed, the user may choose to configure Outlook.com to remember the sweep settings and perform the same move or delete actions for any future emails. Users may also set up custom message rules based on the sender's or recipient's information, the subject of the email, or attachments to the email. There is also an option to delete/move messages that are older than a specified amount of days, or only keep the latest message from a sender.
Quick views and one-click filters
Quick views allow users to filter all emails (in all folders) by document attachments, photo attachments, flagged messages, or shipping updates. One-click filters allow users to filter the inbox (or specific folder) based on whether or not the email message is unread, from the People service list, from group mailing lists or Windows Live Groups, or from a social networking website. Categories appear under quick views for ease of access.
Users can create additional, unique email addresses, called aliases, for their Microsoft account. As of April 17, 2013, users can now sign in with any alias and create up to 10 aliases per year for a total of up to 10 addresses. For a given account, all aliases uses the same inbox, contact list, and account settings—including password—as the primary address. Once an alias is set up, users can choose to have all email sent to that address go to the inbox, or to a different folder. Emails sent from an alias do not reveal to recipients that they come from an account with other addresses.
A single-use code is a code that can be used instead of a user's password when signing into a Microsoft account. Each code can be used only one time, but one can be requested whenever needed. If a user is signing in on a public computer—such as at the library or school—using a single-use code helps keep account information secure. The single-use code is sent to the user when requested during login.
On April 17, 2013, Microsoft added two step verification.
Mail client access
Outlook.com supports email clients connecting through the following protocols, listed in chronological order:
- For access through Microsoft Outlook 2003, 2007, or 2010, users could download the free Microsoft Outlook Hotmail Connector. Using the Outlook connector, users can freely access email messages, contacts, and calendars in any Outlook.com account, though access to tasks and notes requires a premium subscription. Another alternative for users is to use the Windows Live Mail desktop client, which had built-in support for Hotmail.
- Post Office Protocol version 3 (POP3) access has been made available for all Hotmail accounts as part of the "Wave 3" release, adding support to access Hotmail from any email client that supported this protocol.
- As part of the Hotmail "Wave 4" release, Microsoft added Exchange ActiveSync (EAS) support to Hotmail, allowing users to synchronise their email, contacts, and calendar on any device that supports the Exchange ActiveSync protocol.
- On September 12, 2013, Microsoft added support for Internet Message Access Protocol (IMAP) and OAuth.
Popularity with spammers
Like many free Webmail services, Hotmail was often used by spammers for illicit purposes such as junk or chain mailing and unwanted marketing, due to wide availability, service popularity, and ease of registration of new accounts. Hotmail amended its service agreement stating that any account engaging in these activities would be terminated without warning.
Requests for contact details
The ability to associate Outlook.com accounts with mobile phones or other email addresses was initially advertised as an optional feature. However, an update in 2013 required many users to associate their accounts before the website would allow them to login. Some users also saw messages that their accounts would expire if they continued to use them anonymously.
US government surveillance
According to theguardian.com, several top-secret internal NSA newsletters indicate that Microsoft has allowed NSA to access chats and emails on Outlook.com, and implemented a bypass of its advertised encryption in order to facilitate government access.
- One newsletter entry dated December 26, 2012 shows that Microsoft had "developed a surveillance capability to deal" with the interception of encrypted chats on Outlook.com, within five months after the service went into public testing.
- Another entry states that "[f]or Prism collection against Hotmail, Live, and Outlook.com emails will be unaffected because Prism collects this data prior to encryption".
In response to the report, Microsoft stated, among other things, that "[w]hen we upgrade or update products we aren't absolved from the need to comply with existing or future lawful demands" and that "[t]here are aspects of this debate that we wish we were able to discuss more freely".
- Law, David (February 18, 2013). "Outlook.com leaves preview as the world's fastest growing email service going from 0 to 60 million in just 6 months". Outlook Blog. Microsoft. Retrieved 2013-02-19.
- "Outlook.com Site Info". Alexa Internet. Retrieved 2015-03-07.
- "The "Hotmail" Evolution". TechPluto. Accu-rate Media. June 22, 2009. Retrieved 2010-10-26.
- "4th Network Hotels Get Wired with Hotmail E-mail Service and High Speed Internet Access; Hotmail and 4th Network Ink Agreement to Keep Business Travelers Connected.". Business Wire. October 21, 1996. Retrieved 2013-08-01.
- Arrington, Michael (July 9, 2009). "Bing Comes To Hotmail". TechCrunch. AOL. Retrieved 2007-03-23.
- "A short history of Hotmail". Inside Windows Live. Microsoft. January 6, 2010. Retrieved 2010-10-26.
- Thurrott, Paul (July 31, 2012). "Outlook.com Mail: Microsoft Reimagines Webmail". Supersite for Windows. Penton Media. Retrieved 2012-08-01.
- Wilhelm, Alex (October 3, 2011). "Microsoft announces massive Hotmail update to better combat Gmail". The Next Web. Retrieved 2012-06-19.
- "Hotmail Still New and Cool–Even After 15 Years". The Official Microsoft Blog (Microsoft). July 5, 2011. Retrieved 2013-08-01.
- "Hotmail introduces hacking alert system". People's Daily Online. July 15, 2011. Archived from the original on 2012-06-27. Retrieved 2013-08-01.
- "Windows Live Hotmail Launches Worldwide in 36 Languages". IT News Online. May 7, 2007. Archived from the original on 2008-03-05. Retrieved 2010-10-26.
- "Windows Live Hotmail Fact Sheet". Microsoft. May 2007. Retrieved 2011-04-30.
- "Sabeer Bhatiya : The founder of "Hotmail.com"". 4to40.com. Archived from the original on 2007-02-10. Retrieved 2009-11-19.
- "Hotmail, Microsoft talk deals". CNET. CBS Interactive. December 5, 1997. Retrieved 2007-03-23.
- "Solaris calls Hotmail shots for Microsoft". VNU Business Publications. April 22, 1998. Retrieved 2012-01-31.
- Magee, Mike (December 24, 2002). "Microsoft uses Solaris servers for Hotmail shock". Retrieved 2013-08-01.
- "Planning Guide for Migrating Microsoft Hotmail from FreeBSD to Microsoft Windows 2000 Technical Case Study". Microsoft TechNet. Retrieved 23 June 2014.
- Pelline, Jeff (January 3, 1998). "Microsoft Buys Hotmail". CNET. CBS Interactive. Retrieved 2007-06-22.
- "MSN Hotmail: From Zero to 30 Million Members in 30 Months". Microsoft. February 8, 1999. Archived from the original on 2007-05-14. Retrieved 2007-03-23.
- "Converting a UNIX.COM site to Windows". Microsoft Secrets. Security Office. Archived from the original on 2007-11-08. Retrieved 2007-11-03.
- Orlowski, Andrew (December 12, 2001). "Microsoft Hotmail still runs on U**x". The Register. Situation Publishing. Retrieved 2013-06-14.
- Glave, James (August 30, 1999). "Hotmail Hackers: 'We Did It'". Wired (Condé Nast). Retrieved 2007-11-03.
- Greene, Thomas C (August 20, 2001). "Hacking Hotmail made easy". The Register. Situation Publishing. Retrieved 2008-09-17.
- Knight, Will (August 21, 2001). "Hotmail hole leaves email open to view". New Scientist. Retrieved 2011-03-01.
- Paul, Ian (May 3, 2013). "Outlook.com vs. Gmail: What Microsoft is Still Missing". PC World. IDG. Retrieved September 8, 2013.
- Cifuentes, Jamie. "Farewell Hotmail: Microsoft Completes Outlook.com Upgrade". pcmag. Retrieved 22 November 2014.
- Constine, Josh. "Yahoo Shuts Down Mail Classic, Forces Switch To New Version That Scans Your Emails To Target Ads". techcrunch. Retrieved 22 November 2014.
- "M7 new code shipping soon – not yet here!". Microsoft. July 17, 2006. Retrieved 2007-03-21.
- Janowski, Davis D. (January 31, 2007). "Buying Guide: Web E-Mail Clients". PC Magazine (Ziff Davis). Retrieved 2007-03-21.
- Janowski, Davis D. "Windows Live Hotmail (beta)". PC Magazine (Ziff Davis). Retrieved 2007-04-10.
- Muchmore, Michael. "Windows Live Hotmail 2011". PC Magazine (Ziff Davis). Retrieved 2011-09-29.
- "Coming Soon". Microsoft. Archived from the original on 2008-09-14. Retrieved 2010-07-24.
- "Hotmail: Classic scrolling is back, and more updates". Windows Live Wire. Microsoft. December 18, 2008. Retrieved 2013-08-01.
- Shankland, Stephen (2009-01-30). "Google fakes out Hotmail for Chrome support". CNET. Retrieved 2015-02-04.
- "Web IM in Hotmail!". Windows Live Wire. Microsoft. April 20, 2009. Retrieved 2010-07-24.
- "Windows Live Web Messenger goes into dogfood". LiveSide.net. September 19, 2007. Retrieved 2010-07-24.
- Craddock, Dick (May 17, 2010). "Re-inventing Windows Live Hotmail – the next generation of personal email". Inside Windows Live. Microsoft. Retrieved 2010-05-18.
- Schackwitz, Mike (July 28, 2010). "Hotmail rollout picks up steam!". Inside Windows Live. Microsoft. Retrieved 2010-07-29.
- Schackwitz, Mike (August 3, 2010). "The new Hotmail is now available to everyone". Inside Windows Live. Microsoft. Retrieved 2010-08-08.
- Craddock, Dick (August 30, 2010). "Hotmail now supports push email, calendar, and contacts with Exchange ActiveSync". Inside Windows Live. Microsoft. Retrieved 2010-08-30.
- Mehta, Dharmesh (February 3, 2011). "Hotmail delivers aliases to help you manage and secure your email account". Inside Windows Live. Microsoft. Retrieved 2011-11-06.
- Mehta, Dharmesh (February 3, 2011). "Instant email: how we made Hotmail 10x faster". Inside Windows Live. Microsoft. Retrieved 2011-06-30.
- Craddock, Dick (October 3, 2011). "Hotmail declares war on graymail". Inside Windows Live. Microsoft. Retrieved 2011-06-30.
- Warren, Tom (October 3, 2011). "Hotmail updated to include Gmail-like labelling and more Outlook features". WinRumors. Retrieved 2011-10-30.
- Kniskern, Kip (October 3, 2011). "Giving Hotmail another look". LiveSide.net. Retrieved 2011-06-30.
- "New Hotmail begins rolling out, coming to all customers in "next few weeks"". LiveSide.net. November 9, 2011. Retrieved 2011-11-20.
- Jones, Chris (July 31, 2012). "Introducing Outlook.com - Modern Email for the Next Billion Mailboxes". Outlook Blog. Microsoft. Retrieved 2012-07-31.
- Craddock, Dick (July 31, 2013). "One year since the preview of Outlook.com – thank you for helping us build the world's fastest growing email". Outlook Blog. Microsoft. Retrieved 2013-08-01.
- Brengel, Kellogg (May 21, 2015). "Microsoft updates Outlook.com with new features and user interface". WinBeta. Retrieved July 9, 2015.
- Kniskern, Kip (June 5, 2015). "Hands on with the newly overhauled Outlook.com, or "Outlook on the web"". WinBeta. Retrieved July 9, 2015.
- "Ad-free Outlook.com". microsoft.com. Microsoft. Retrieved 20 October 2014.
- "Windows Live Admin Center". Microsoft. Retrieved 2013-12-06.
- "Scroogled!". Microsoft. Retrieved 2013-04-06.
- "Outlook.com tips to try - Keep your stuff private". Microsoft. Retrieved 2013-04-06.
- Hiner, Jason (August 2, 2012). "Dump Gmail for Outlook.com? Four reasons you might". Tech Republic. CBS Interactive. Retrieved 2013-04-06.
- Foley, Mary Jo (March 19, 2014). "Former Microsoft employee arrested for allegedly stealing Windows 8 trade secrets". ZDNet. CBS Interactive. Retrieved 2014-03-24.
- "Microsoft admits reading Hotmail inbox of blogger". BBC. March 21, 2014. Retrieved 2014-03-24.
- Pagliery, Jose (March 21, 2014). "Microsoft defends its right to read your email". CNN Money. CNN. Retrieved 2014-03-24.
- Crocker, Andrew (March 21, 2014). "Microsoft Says: Come Back with a Warrant, Unless You're Microsoft". Electronic Frontier Foundation. Retrieved 2014-03-24.
- Masnick, Mike (March 20, 2014). "Microsoft Looked Through Reporter's Hotmail And MSN Chat Accounts To Identify Windows 8 Leaker". Techdirt.com. Retrieved 2014-03-24.
- Cooper, Charles; Rosenblatt, Seth (March 20, 2014). "Microsoft sniffed blogger's Hotmail account to trace leak". CNET. CBS Interactive. Retrieved 2014-03-24.
- "Microsoft Online Privacy Statement". Microsoft. Retrieved 2014-03-24.
- Bott, Ed (March 24, 2014). "What's really behind Microsoft's investigation into software leaks?". ZDNet. CBS Interactive. Retrieved 2014-03-24.
- Bright, Peter (March 28, 2014). "Microsoft will no longer look through your Hotmail to investigate leaks". Ars Technica. Condé Nast. Retrieved 2014-03-29.
- Smith, Brad (March 28, 2014). "We're listening: Additional steps to protect your privacy". Microsoft on the Issues. Microsoft. Retrieved 2014-03-29.
- Longbottom, Simon (April 29, 2013). "Type Less. Talk More. Make Skype Calls Directly From Your Outlook.com Inbox". Skype. Retrieved 2013-05-05.
- "Add an Outlook.com alias to your account". Microsoft. Retrieved 2013-05-11.
- Vitaldevara, Krish (December 10, 2012). "Outlook.com increases security with support for DMARC and EV certificates". Outlook Blog. Microsoft. Retrieved 2012-12-12.
- "Continuing DAV protocol retirement". Mail Call. Microsoft. June 2, 2009. Retrieved 2010-10-26.
- Stanclift, Michael (June 4, 2009). "Microsoft to kill Hotmail via Outlook Express on September 1". Neowin. Retrieved 2010-10-26.
- "Windows Live Mail". Microsoft. Archived from the original on 2008-12-03. Retrieved 2010-10-26.
- "POP3 Technology Has Now Rolled Out To Hotmail Customers Worldwide". Liveside.net. March 13, 2009. Retrieved 2010-10-26.
- "Windows Live Hotmail Reviewer's Guide: What's new in Hotmail". Windowslivepreview.com. Retrieved 2010-07-24.[dead link]
- Kafka, Steve (September 12, 2013). "Outlook.com now has IMAP". Outlook Blog. Microsoft. Retrieved 2013-09-13.
- "We are the Outlook.com team, Ask us anything!". Reddit. September 12, 2013. Retrieved 2013-09-12.
- Danchev, Dancho (July 3, 2008). "Gmail, Yahoo and Hotmail's CAPTCHA broken by spammers". ZDNet. CBS Interactive. Retrieved 2013-08-01.
- "Microsoft Services Agreement". Microsoft. May 2009. Retrieved 2009-08-05.
- "Microsoft Anti-Spam Policy". Microsoft. Retrieved 2009-08-05.
Microsoft may immediately terminate any account on any Service which it determines, in its sole discretion, is transmitting or is otherwise connected with any email that violates this policy
- Blakemore, Eve (2012-08-16). "What if I no longer have access to my secondary email address?". Microsoft. Retrieved 2015-02-04.
- Jones, Ted (2013-09-11). "Microsoft is trying to get my phone number". Retrieved 2015-02-04.
- Greenwald, Glenn; MacAskill, Ewen; Poitras, Laura; Ackerman, Spencer; Rushe, Dominic (July 12, 2013). "How Microsoft handed the NSA access to encrypted messages". theguardian.com (Guardian Media Group). Retrieved 2013-07-12.