Email and Webmail Statistics

I just found this page which compiles some usage stats for webmail providers. Roughly:

• Hotmail: 256.2 million
• Yahoo: 254.6 million
• Gmail: 91.6 million
• AOL: 48.9 million

These number seem a bit off (Gmail is probably too low, Hotmail too high). The article goes into more detail on sources and estimates - I suggest you check it out.