After Meebo success story it was very clear that there is significant demand for instant messaging via the browser - many users work from computers where they can’t download software and so web based instant messaging is the only way they can use the service. Also there simple ways of using a messenger service in office where they restrict software downloads.
Yahoo too will launch a dedicated site for Yahoo chat at webmessenger.yahoo.com. It should be live within a day or two. Yahoo Web Messenger is built on Flash 9. At launch it will include only basic functionality, and is integrated with MSN Messenger, however VOIP functionality may be added later. Microsoft has its own web messenger.