I see numbers like this often and they make me wonder how active these various users are. I have a few old hotmail accounts and a couple old yahoo accounts.. 3

I see numbers like this often and they make me wonder how active these various users are. I have a few old hotmail accounts and a couple old yahoo accounts.. 3 of which I know are still active... But I check those addresses annually and they mostly exist to handle my spam. Is Yahoo's 40% active people? When was the last time they checked their email? Do those people check their email via pop? What is the volume of useful communications for the users of these various systems. Do your numbers above represent addresses you've collected or just a rehash of the general numbers on the topic? Is there any way to get more fine grained details about these various suer groups?