Do any other people use your windows logon, and could they have
accessed other mail or AOL accounts?
I ask because AOL provides you with a master account, and you can make
like six other screen names. If you had a few emails in each account
and you logged into them all without marking the messages as read,
they could all show up. Likewise, if just one other person uses the
same Windows logon as you and they logged into their account, any
unread mails could show up there. The same thing most likely applies
to any other email clients.
First I'd check all your email accounts. If that doesn't help, (and
assuming you have SP1 or newer) try downloading TweakUI.exe (link
below) from Microsoft. It will allow you to access a few system
settings that you can't alter by default. One of these options (Logon
from showing.
http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx
I am the only person who uses this computer. The only use my AOL for email and I know it is not my broadband Comcast there was only 1 email there and the message says there are 15. The total message says:" You have 15 unread messages" . If I knew just where to look I have it made.