Yahoo mail is one of the popular mail service few years back. Around 2000, this website was at its peak. That was just the starting phase for google. It was able to purchase google at that time.
Google demands 1 million, yahoo refused it. That was the biggest mistake of the yahoo owner and ceo. Yahoo does not upgrade their services and even they did not try someting new. So you can ses the result.
Recently yahoo was purchased by varizen company in just 4 million dollar approx.
Yahoo teach everyone that change is the key to be on the top. If you do not change, then there is no tomorrow for you.