Ok, Im bored so Im gonna take a swing at this.

When you do voice convo you need to direct connect. The reason for this is to overcome the packet limitations the program sets up inorder to sotp spam and other crap from happening. when you direct connect you can runa command in dos (im not sying it becasue if hell have to learn it the same way I did, read a book) that will list all connection. next to each connection it will have a code to distinguish one connection from another ie. a web page you are looking at and the vice convo, the codes are listed on a microsoft webpage as well as many other dos basics web pages. after getting your IP, there are websites that can track the ip to a location, so thats how he did that. Now tall of this takes less skill then playing most computer games. As for getting your text convos, this may have taken some effort. MSN has an archive of your messages. It records them I believe, so does Yahoo messanger. Well after getting your IP he could have easily ran a port scan on you, and found a nice little entrace, from there he had access to your files ie the message archives. Not to difficut fo a thing to do.

Stage two: the defense. First and better then anyfire wall out there is common sense, ont Direct cnnect with people you dont know. this includes voice chat. Unfortunaly there are *******s out there that want to **** with you.

second: get a good sftware firewall, look for specifics when purchasing one like one that does port checks and stuff to make sure your all sealed up.

I would also learn some basic networking stuff so you can mask your ip.

now if you are on a dailup connection dont wory about what happend becasue chances are your not on a static I adress and if he trys to connect to you again hell have a difrferent person. If your on static, cal your isp and request that you have a change of IP. for my ISP all I have to do is reset my cable modem and it will give me a new ip because it uses dhcp to connect me. I hope this helps a little.

oh and to prevent the messages from being stolen find and delete the archives. also look for a disable archiving option.