The famous Microsoft tagline from 1996 is a very big question for many big websites. What do you visit on Google, Yahoo and MSN? The most visited page for Google is, of course, Google homepage. But things aren't the same for Yahoo. Most users visit Yahoo just to check their mail. That's why Yahoo disabled POP3 access on Yahoo Mail. MSN's situations looks even more dramatic: 3 from 4 visitors go to Hotmail.
google
google.com - 75%
images.google.com - 9%
mail.google.com - 7%
groups.google.com - 2%
video.google.com - 2%
news.google.com - 1%
froogle.google.com - 1%
yahoo
mail.yahoo.com - 53%
search.yahoo.com - 9%
news.yahoo.com - 3%
login.yahoo.com - 3%
bid.yahoo.com - 2%
yahoo.com - 2%
finance.yahoo.com - 2%
msn
hotmail.msn.com - 73%
search.msn.com - 8%
spaces.msn.com - 5%
msn.com - 3%
msnbc.msn.com - 2%
moneycentral.msn.com - 1%
arabia.msn.com - 1%
*The data is provided by alexa.com and it's not statistically accurate.