Originally posted by: Ness
I think google is smarter than that. They wouldn't try to enter a market so big as the underdog with nothing new to offer.
Microsoft does it all the time. For example, when they started Messenger, AIM and ICQ already had a major foothold in the IM world. Now MS has something like 120M unique users, and their servers are handling over 13M simultaneously online users at any given time throughout the day. They haven't surpassed AIM in America, but most countries in the Far East are almost exclusively using MSN Messenger.
Other examples: When MS started Word, just about everyone was using WordPerfect. When they started Excel, most people were using 1-2-3. There were other players too, but you get the gist...
Google has a strong reputation and major brand name recognition. They would just need to offer something a little different that no other IM client has, something cool the other companies didn't consider, whatever...