I just checked my Yahoo Messenger and then noticed that right now the newest version of Yahoo Messenger 11 is available. It been said that the current available version is the version 18.104.22.168 (the Update for version 22.214.171.124 now available. FYI, this update would allow you to show/hide the “Recent Contact list view” via “Contacts” Menu).
You are currently running Yahoo! Messenger 126.96.36.199. A newer version, Yahoo! Messenger 188.8.131.52 is now available. Please update your version of Yahoo! Messenger to ensure that you have the latest features and security updates. Click the “Update Now” button to continue
This news definitely right because it also been said also at the official of Yahoo Messenger Blog. According to this official blog, the newest version 11.5 has a capability to create tab windows Instant Message (Tab-IM). The Tab IM is placed on the bottom of the windows IM. For the quick look overview, it can be seen from the picture below.