Jester2K II is correct, you can only send from the ISP you are logged on to. If you go to "Keyword" and type "Communicator" you can download AOL's new Communicator program.
Once set up this will act as a central point for all your incoming mail from pop 3 servers and you will be able to read then reply to them direct from the program.
So you will be able to read and reply to your freeserve mail through AOL. But you cannot use freeserve to initiate a mail in the first place. This will still need to be done through Freeserve, by logging on to them or any other ISP that you subscribe to. j.
I had the same problem when i changed my isp, all i did was to connect with my new isp as normal and log onto the old isp's website and check my mail with the webmail service, like hotmail, so you are not downloading anything to your comp therefore you can just send it online.
hope i made sense as i am finding it hard to get my words out today (works christmas do last night) ha ha