Yahoo! Messenger (YIM) is an ad-supported instant messaging client and protocol 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.

“Just sign into Yahoo! Mail to enjoy the same Yahoo! Messenger for the Web service you know and love. Yahoo! Messenger within Yahoo! Mail also allows you to chat with your Facebook and Windows Live friends without requiring any installation. Send text messages in real-time to your friends on Yahoo! 7 or Windows Live™ Messenger. Share photos from your desktop or Flickr, then discuss them over IM while you and a friend view them together....”

AT&T Yahoo! Messenger is an AT&T branded version of Y! Messenger.

“Access your Rogers Yahoo! Internet favourites and search from anywhere on the web. The built in Pop-Up Blocker can also help keep annoying pop-up advertisements and messages from appearing while you surf the web. Customize and access your toolbar from any PC. Connect in real-time with friends by sending instant messages and sharing files. Plus IM with friends that use Windows Live™ Messenger! Protect against accidental deletion, hardwa...”

Yahoo Install Manager manages Yahoo program downloads and installations. The install manager keeps track of such programs and assists in the installations to put things in their proper places.