This is the Original Yahoo Messenger Version 10. Its for XP, Vista etc.

Offline Setup file - You dont even need to be connected to the internet to install this one

Connect with all your friends:
Instant message friends on Yahoo! and Windows Live™ Messenger. See which friends also use Yahoo! Messenger
Stay in control...24/7:
Decide who sees you online with stealth settings
Share away:
Swap photos and monster files (up to 2G in real-time)

System requirements: Microsoft Windows XP, Vista.