Summary: Independent International Investment Research, a British company that specialises in research and has several leading City investment banks as clients, argues that it launched "G-MailTM web based email" in May 2002.
Apparently it would've been a whole lot easier to refer to the product as Google Mail. I'd bet someone has used every letter of the alphabet to describe some product many times. Come up with a winner and someone will come of the woodwork shaking their left finger at you while holding out their right hand.(vice versa for lefties.)
Those darn single letter adjectives get you into trouble every time.
If Google lose I have Google Mail domain name (Not the dot com) but I am letting it expire at the moment! I will give it to Google for free if they ask rather than letting it go to some greedy person who would only end up getting sued.