"They weren't happy he was dating an older woman, " says Jay Im, another childhood friend of Ko's.

CNN: NIGHTMARE IN NEW YORK

"As these kids get older, we're going to see IM really take over as the preferred method of communication over e-mail, " says Yahoo's Miller.

FORBES: Just Speechless

The software started life on Symbian and Series 40 devices before falling out of favor with Nokia, but this WP8 refresh enables cross-platform chatter between those older phones, the newer Lumia range and, as Yahoo Messenger contacts are supported, anything running that IM client, too.

ENGADGET