As the communications landscape continues to change over, we're focusing on building and introducing new, exciting communications tools that better fit consumer needs.There currently isn’t a replacement product available for Yahoo Messenger.Until then, you can continue to use the service normally.
It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one conversations etc. This affects people browsing the web with Internet Explorer while XChat is running.
The problem does not exist if Firefox is your default browser.
Development is under way to standardise a IRC services protocol.
We will be supporting an effort at and I urge all IRC server authors to get involved.