Yahoo! Messenger

Yahoo! Messenger is an advertisement-supported instant messaging client and associated protocol provided by Yahoo!. Yahoo! Messenger is provided free of charge and can be downloaded and used with a generic "Yahoo! ID" which also allows access to other Yahoo! services, such as Yahoo! Mail, where users can be automatically notified when they receive new email. Yahoo! also offers PC-PC, PC-Phone and Phone-to-PC service, file transfers, webcam hosting, text messaging service, and chat rooms in various categories.

Yahoo! Messenger was originally launched under the name Yahoo! Pager on March 9, 1998.

In addition to instant messaging features similar to those offered by ICQ, it also offers (on Microsoft Windows) features such as: IMVironments (customizing the look of Instant Message windows, some of which include authorized themes of famous cartoons such as Garfield or Dilbert), address-book integration and Custom Status Messages. It was also the first major IM client to feature BUZZing and music-status. Another recently added feature is customized avatars.

Announcements

On December 5, 2007, Yahoo! Messenger announced the release of Yahoo Messenger for Windows Vista as a Beta Release. It includes transparent Glass Windows and a new skin and GUI for the Windows Sidebar and program. Also integrated new tabs for going between different chat windows. As of October 25, 2008, Yahoo! Messenger for Vista version is no longer available.

On October 29, 2007, Yahoo! Messenger announced the release of Yahoo! Messenger 9 Beta. It features a new and improved interface, new emoticons (also hidden emotions), the integration with Flickr account and a new in-line media player which enables the user to view maps, photos and videos from sites like Yahoo! Video and YouTube right in the IM window.

Yahoo! has announced a partnership with Microsoft to join their instant messaging networks. This would make Yahoo! Messenger compatible with Microsoft's .NET Messenger Service. It also made Microsoft's Windows Live Messenger compatible with Yahoo!'s Network. This change has taken effect as of 13 July 2006 - Yahoo! Messenger has integrated instant messaging with Windows Live Messenger users, and is fully functional.

British Telecommunications' BT Communicator software is based on Yahoo! Messenger. BT Communicator was withdrawn on 31 December 2006.

Features

Yahoo! Voice

Yahoo! Voice is a Voice over IP PC-to-PC, PC-to-Phone and Phone-to-PC service, provided by Yahoo! via its Yahoo! Messenger instant messaging application in the United States only. It is also available for the Mac OS X platform.

Voicemail and file sharing

Yahoo! added voicemail and file sending capabilities to their client. File-sharing of sizes up to 2GB was added to Yahoo messenger

Plug-ins

As of 8.0, Yahoo! Messenger has added the ability for users to create plug-ins (via the use of the freely available Yahoo! Messenger Plug-in SDK), which are then hosted and showcased on the Yahoo! Plug-in gallery. Yahoo now no longer provides plugin development SDK.

Yahoo! Mail integration and Web Messenger conversation archival

Yahoo! plans to integrate Yahoo! Mail Beta and Yahoo! Messenger. Conversations will be archived and stored in the same manner as emails. This allows users to search within their chat logs easily, and to have them centrally stored and accessible from any computer. However, even though both an integrated messenger and a separate, Adobe Flex-based web messenger were released in Spring 2007, the web archiving of chat sessions has only been added as a feature to the separate Web Messenger as of 2009.

Furthermore, unlike Google Talk, for which Gmail provides an integrated archival of conversations, neither Yahoo! Mail nor Yahoo! Web Messenger provide any integration with the standalone Yahoo! Messenger client; as a result, archival of conversations in the Messenger desktop client and Web Messenger is separate from each other, and does not carry over from each other.

Chat

All versions of Yahoo! Messenger have included the ability to access Yahoo! Chat rooms. On June 19, 2005, with no advance warning, Yahoo! disabled users' ability to create their own chat rooms. The move came after KPRC-TV in Houston, Texas reported that many of the user-created rooms were geared toward pedophilia. Many regulars in these rooms used the rooms to set up meetings to have sex with children and trade lewd pictures. While it was thought this move came as a result of several advertisers pulling their ads from Yahoo!, a more likely cause was a $10 million lawsuit filed by watchdog groups of internet portals on behalf of a 12-year-old victim of molestation..

Yahoo! has since closed down the chat.yahoo.com site (which is now a redirect to a section of the Yahoo! Messenger page) because the great majority of chat users accessed it through Messenger. In August 2007, it began requiring word verification in order to use Yahoo! Chat. Officially, this is to guard against spammers and automated bots, which had been a source of frustration for many chatters (This method has proved highly unsuccessful, as many rooms now have more bots than users). However, as this also logs users' IP addresses, this feature could presumably be used to monitor against the type of behavior that prevailed in the pedophilia-oriented rooms. The company claims to be still working on a way to allow users to create their own rooms while providing safeguards against abuse.

As of November 2008, Yahoo's inability to control chat bots and spammers continues to be a major issue. Over 90% of all chat messages, even in supposedly family oriented chat rooms like genealogy, appear to be originated by automated spam bots spewing solicitations for adult activities, web cams and pictures.

On October 16, 2008, the Yahoo! Profiles community rolled out a new “beta” profile network with no prior announcement. According to customer feedback, the new profiles now resemble a “stripped-down version of MASH.”

This unexpected move resulted in hundreds of thousands of existing profiles being cleared of all information and images.

Webcam

Yahoo’s software now allows users with the most current updated versions (messenger 8 through 9) to utilize its webcam service. This option enables users from distances all over the world to view others who have installed a webcam on their end. The service is free with provided speeds averaging from a range in between 1 to 2 frames per second. The resolution of the images can be seen starting at 320 x 240 pixels or 160 x 120.

URI scheme

Yahoo! Messenger's installation process automatically installs an extra URI scheme ("protocol") handler into some web browsers, so that URIs beginning "ymsgr:" can open a new Yahoo! Messenger window with specified parameters. This is similar in function to the mailto: URI scheme, which creates a new e-mail message using the system's default mail program. For instance, a web page might include a link like the following in its HTML source to open a window for sending a message to the YIM user notarealuser:

Send Message

To specify a message body, the m parameter is used, so that the link location might look like this:

ymsgr:sendim?notarealuser&m=This+is+my+message

* ymsgr:addfriend? Example: ymsgr:addfriend?myid

   * ymsgr:sendfile? Example: ymsgr:sendfile?myid

   * ymsgr:call? Example: ymsgr:call?1-800-555-7654

   * ymsgr:callPhone? Example: ymsgr:callPhone?1-800-555-7654

   * YMSGR:chat? "opens chat room list"

   * ymsgr:im? Opens "send an im window"

   * ymsgr:getimv?doodle

   * ymsgr:getimv?yfighter

 

Offline messaging

Offline messaging, a feature long offered by Yahoo!, allows online users to send messages to their contacts, even if said contacts are not signed in at the time. The sender's offline contacts will receive these messages when they next go online.

Interoperability

On October 13, 2005, Yahoo! and Microsoft announced plans to introduce interoperability between their two messengers, creating the second-largest real-time communications service userbase worldwide: 40 percent of all users (AIM currently holds 56 percent). The announcement comes after years of third-party interoperability success (most notably, Trillian, Pidgin) and criticisms that the major real-time communications services were locking their networks. Microsoft has also had talks with AOL in an attempt to introduce further interoperability, but so far, AOL seems unwilling to participate.

Interoperability between Yahoo! and Windows Live Messenger was launched July 12, 2006. This allows Yahoo! and Windows Live Messenger users to chat to each other without the need to create an account on the other service, provided both contacts use the latest versions of the clients. For now, it's impossible to talk using the voice service among both messengers.

Games

There are various games and applications available that can be accessed via the conversation window by clicking the games icon and challenging your current contact. It requires Java to work.

Malware

Yahoo! Messenger (along with other networks such as Windows Live Messenger and AOL Instant Messenger) is often used as a conduit or "vector" for delivering malicious software such as spyware, viruses, worms, and trojans to unsuspecting computer users. The three methods used by hackers to deliver malware over the IM vector are (1) sending a file transfer with a virus-infected file, (2) delivering a message with socially engineered content containing a web address (URL) containing active malicious code and (3) sending specially crafted messages exploiting security vulnerabilities in the client software. Viruses and worms with colorful names such as W32.Yalove or W32/Spybot-MQ have been identified as targeting users of the Yahoo! Messenger network over the past few years.

The most common method of delivering a malicious payload is the use of social engineering to construct a message that appears to be coming from a contact on the recipient's contact list. A socially engineered message is one that is written in a friendly, informal manner, that could easily be mistaken as coming from a friend. The message usually will say something like "Click here to see pics of me from vacation!" or "Is this you?" with a web address—known as a "poison URL" -- for the recipient to click. Upon clicking the web address, the recipient is connected to a website containing active content, which is immediately downloaded to the recipient's computer. In most cases, the payload contains an installer, a number of hidden files containing text, and code which causes the same socially engineered message with poison URL to be sent to every contact on the contact list. When the message is sent to all contacts, the cycle starts again, as each contact believes they are receiving a message from a trusted friend. In this manner, IM-borne malware is capable of propagating very rapidly through company and external networks.

Worms and viruses are discovered on a regular basis by security companies, particularly by the three companies with IM-specific security products, Akonix Systems, FaceTime Communications, and Symantec. According to IM security researchers at Akonix, the number of new threats identified each month is 30 to 35, with a high of 88 in October, 2006.

More recent versions of Yahoo Messenger also behaves in a way similar to malware. The most recent version, upon install, will install Yahoo Toolbar in both Internet Explorer and Firefox. In addition, the default pages of the browsers are changed to point to Yahoo's main page. Yahoo Messenger also installs several files including something called 'Search Protection' that watches to see if the default searches are changed. All of this is done without warning or confirmation by the user. This has led a number of spyware tools such as HijackThis to specifically list Yahoo Messenger components in its scans.

SPIM

Yahoo! Messenger users are subject to unsolicited messages (SPIM) and the problem remains unresolved. Blogs and websites addressing this issue are supportive of the chat environment, and writers genuinely want to continue using the service, yet express frustration about Yahoo's apparent failure to address spam and other related problems. User queries are met with forms and replies that Yahoo is "working to resolve the problem," yet there is no evident progress. As of 2007 it is estimated that at least 60% of all users who use Yahoo chat rooms are bots. Yahoo has introduced a CAPTCHA system to help filter out bots from joining chat rooms but it has done little to actually stop the problem and has only inconvenienced human users.

Source : www.wikipedia.com