And are getting petty with it apparently. Xoopit organizes photos in Yahoo Mail and provides a similar Gmail service. Not any more.

Xoopit also provides a Web application for rival Google's Gmail service, and Web observers noted that Xoopit has stopped accepting new Gmail users. A notice on Xoopit's Web site said the service will "continue for the time being to operate for existing users."

PC World blogger David Coursey chided Yahoo for "allowing corporate ego to overwhelm common sense." He wrote that Yahoo has said current Gmail users could also be cut off from the Xoopit service.
Too right, David. That's childish.

New Gmail Users Cut Off as Yahoo Acquires Xoopit