I can't fathom how they managed to not have decent clients for every mobile platform...
> But like other services in that first generation of messaging, Messenger’s role and functions were swiftly surpassed by faster and more functional mobile-based services, and specifically mobile messaging apps. Notably, WhatsApp was created by ex-Yahoo employees.
If we ignore the mobile aspect, almost no modern messenger has as many features as Yahoo Messenger used to have. Notably, it was one of the first messengers to have offline messages. You could set an "invisible" mode so that your friends (or boss) wouldn't see you online, either globally, or just per user (basically ignore user). It had a million features, some I still don't see in modern messaging clients.
Perhaps not glamorous, but it was possibly the most dog-fooded product for all employees – at least IME. Literally every single person I ever interacted with while working there (for 11 years) used it as their primary means of communication with other colleagues. Up to and including David Filo (memories of "hey, Yahoo! Greece homepage is down, can you help?" popping up on my screen one morning)
AIM could have been facebook, it could have been slack, or skype. The management was just incredibly short sighted and couldn't figure out how to make money from it.
Imagine.
Same goes for AOL. No other company really understands what facebook has done yet. They have a two layer app, that lets you use both parts simultaneously, independently, or together. Its a different form of window management. I can drag from the background news app to the foreground chat app to share a post in a message.
Yahoo Messenger losing its relevance was an even bigger failure than Google killing Gtalk (at least Google sort of continued it through the resource and data hog Hangouts).