In many corporate networks, Instant Messengers like MSN, Yahoo, Google Talk and AIM are not allowed and ports are disabled. You also need to have these software applications installed in your computer. But in most cases, desktop users are not permitted to install any software, for security reasons.
Now, what is the solution for you to access messenger services and chat with your friends? even in the restricted environment? I am listing some options, which might work for you. If you are caught using these services, do not blame me, ok? 
When you are at some internet cafes, you may not have your preferred messenger installed in the desktop! And you do not want to wait to get the software downloadd and installed. The options listed below are going to help you to chat faster.
MSN, Yahoo, Google, AOL and ICQ provides their own web messengers. There are other third party web messengers like Meebo, KoolIM, ILoveIM and eBuddy providing integration of various messengers in a single place.
MSN Web Messenger lets you chat online and in real-time with friends and family using just a web browser! Use it on any shared computer – at school, at work, at a friend’s house or anywhere you can’t install the MSN Messenger software. Popups neds to be enabled for this web site if you are using popup blocker software like the MSN Toolbar.
Yahoo Web Messenger works from any Java enabled browsers.
Google Talk – Web Messenger allows you to chat with your friends from any web broswer having Flash support.
AIM Express® service is convenient whenever you’re away from your home computer: at school, the office, or a friend’s house. Use it whenever you have to be discreet.
ICQ2Go! is a web-based installation-free ICQ version. With the essential communication tools, it offers a solution for connecting from Internet Cafes and other computers, where download and installation is not an option. There is a Flash based version as well as java based version.
Meebo.com is a website for instant messaging from absolutely anywhere. Whether you are at home, on campus, at work, or traveling foreign lands, hop over to meebo.com on any computer to access all of your buddies (on AIM, Yahoo!, MSN, Google Talk, ICQ and Jabber) and chat with them, no downloads or installs required, for free!
KoolIM.com is a web messenger application that allows you to stay connected with your favorite Instant Messenger almost anywhere. You need a computer with just a browser only.
There is no need to download and install any software or Java plug-ins into your computer to use KoolIM.com Web Instant Messenger. KoolIM.com provides friendly, light and very easy to use web-based interface with almost all core features from the original Instant Messenger.
Another great benefit of our Web Messenger – it works behind a firewall or proxy servers. Use our Web Instant Messenger to chat with your friends everywhere! We support AIM, ICQ, MSN, Yahoo, IRC, Jabber and others on the consumer side. We also support Sametime, Simple, SIP, LCS, and Jabber.
ILoveIM.com
is another Web Messenger like KoolIM and Meebo. It supports Yahoo, MSN, Google Talk and AOL.
eBuddy.com is a free web based messenger that enables you to chat with your MSN, Yahoo and AIM buddies.
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