since it's all on your harddrive.
All you have to do is change the settings to your new ISP, and all will be well and good.
I have one yahoo account I use for my shitwork - ebay, or anything that I don't want my "real" address given out for.
For my real email, I bought my own domain, which is so nice to have, and it's hosted by a friend who has his own servers, so my tech help is pretty easy, and it's free (except for the cost of the domain). :-)
I would suggest that you not go with any ISP's email, since they will all get hit heavy by spammers, because spammers know there are millions of people on AT&T and yahoo and hotmail, and just generate random lists of names and blast mail them all out.
My suggestion is that you check out fastmail.fm - I'm using it for another account, having it aliased for another domain that I bought. but you don't have to do that, you can just get a fastmail.fm account, which I think is maybe $10 a year, and it's IMAP capable, POP capable, and also all your email is viewable through the web. So you can download it to your own email program, and when you're traveling, if you don't take your computer with you, you can check your mail on any computer that has Internet access.
And fastmail.fm has some pretty good spam filtering software, but even more importantly, they have great customer support and they are a GREAT place to do business. I've had an account with them for about 1.5 years, and a friend of mine has had an account for 4 or 5 years, and raved (and still raves) about it constantly.
I recommend it highly. It will get you away from the free shitty ones, and it's also ISP independant, so you can change ISPs all you want with no worries.
i also suggest you ditch Outlook Express and get a good email program, like Eudora, Pegasus, or evcen better, The Bat!, which i've used for years and it's the only software program that I **refuse** to live without. (
http://www.ritlabs.com)