Someone used my computer to check his email using Internet Explorer. 
Afterwards, in the
history there was an icon MY COMPUTER with a sub icon envelope saying
mail on it.
When I clicked it awindow popped up from Outlook EX with an address I
never heard of in the to; box and my address in the From box.  The  To
address was on AOL.  Question.......Does my computer mean HIS computer
or mine?  Did he check his email at that address or send an email to
that address?  Or could he have done either or both of those functions?   I have
checked everywhere on the internet and can find no ans. to this.

Hi there charae,

The reason for this is that he (or someone) clicked on an e-mail link
while on a webpage.

For example, if you were on a website and it said "Click here to mail
me", and you clicked it, Outlook Express would open a new e-mail
message ready to be sent to the address you just clicked.

Now, if you went back to Internet Explorer and checked the Internet
history, you would see that under "My Computer" there would be a link
to the very same e-mail address.

So it means that someone clicked an e-mail address on a website. It
definately means "Your Computer" not "his". Also, it doesn't mean that
he checked e-mail at that address.

Hopefully this clears up your confusion. Please let me know if you
need any further explanation and I will be happy to help.

Thank-you.

very clear, easy to understand