Psi

Psi is a powerful Jabber client that allows you to chat with your friends using a very user friendly interface and well-developed features supposed to enhance the overall chatting experience.
Setting up an account is pretty easy, you just need to know your username and password and, in case you're using a different server, the server address.
Once you connect, there are a lot of features available, including instant messaging must-haves, such as emoticons, file transfer, avatars and sounds. Obviously, you can set status messages and even use the song you're listening to as a brand new status message using a dedicated tool in this regard.
While the application is pretty easy to use and it's just a matter of time until you discover all features, the settings menus are gigantic and let you configure most of the goodies underneath Psi's hood.
For instance, you can setup events, default status messages, appearance, groupchat, sounds, voice calling, toolbars, shortcuts and accounts, all with the help of very intuitive menus that need just a few seconds to figure out how to use them.
One of the best things about this cross-platform instant messaging client is the fact that it runs on very low hardware resources, without affecting computer performance at all.
But the ace up its sleeve remains the impressive customization power offered to its users, as anybody can change almost everything about the application with just a few clicks.
Of course, the program works on all Windows versions on the market and has absolutely no problem to run smooth on Windows 7 workstations, without administrator privileges.
Simply put, Psi is one of the best Jabber clients on the market and thanks to the customization options and the user friendly interface it boasts, it can be safely used by anyone without any risk.