Yes, Yahoo! does a Google in this. Not bad in my opinion however restricted it is. Considering the time it took for them to do this, I am willing to accept their large market share as the reason.
Quote:
In the first public demonstration of the combined service at the Web 2.0 conference here, Garlinghouse and a colleague showed how, when a user opens up and addresses an e-mail, an icon appears if he or she is online.
Clicking the icon instantly transforms a conversation from the delayed, read-it-when-you-have-a-chance way people use e-mail into the immediate back-and-forth of an instant message conversation.
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Y!m in your Web Mail
Won't that be really convenient? 
Linear Mode
