However, Yahoo! Messenger displays ads in it and you don’t want to see that ads and want to remove them from your favorite IM client, here is freeware tool called Ad Banner remover Plus.
It helps to remove ads from main window, chat window, change chat room banner ads and webcam window ad.
Moreover, this tool also lets you login using multiple accounts simultaneously (multiple instances of Yahoo! Messenger).
Similar topics: How to remove ads from Yahoomail,Gmail and Hotmail?