How important is Yahoo’s email service? Extremely. It’s the biggest property Yahoo (YHOO) has, as illustrated by this Hitwise graph. Yahoo Mail receives 36.7% of the visits to 80 top Yahoo properties. The homepage is 25.5% and Yahoo Search is 11.8%.
The good news: Yahoo’s share is steady, even growing a bit. Among Yahoo, Microsoft, and Google, Yahoo had 56% share in February, up 3% year-over-year. Microsoft (MSFT) Live/Hotmail dropped 25% to 19%; Google’s (GOOG) Gmail grew 88% to 11%. Note that this doesn’t include AOL (TWX).