Yahoo! messenger (60 million users worldwide) adds plugins, it gives external developers the chance to create tools that can work with the yahoo messenger. This gives the developers huge opportunities to work with a very large audience.
In Belgium, the most popular messenger is msn messenger (240 million users world wide) or I should say Windows Live Messenger. It would give great opportunities to support marketing campaigns or extend communication functionalities between friends. It can add a nice viral touch to a campaign.
So let’s hope microsoft has the same plans for windows live messenger.