OE XP to 8.1

I need answers from the line. I just got a HP Pavilion 500-217 with Win 8.1. Not really wanting to do this because my multimedia computer with XP pro has been terrible for years and just at the moment where I get everything goes perfectly, I said me XP ends (Thanks much BG) and I have to buy something else. So here I am.

OK, so maybe it is better that I had a HP which is faster, more memory, more storage, etc., but I have tons of data and email that I can not use the HP unless and until I can move it all intact of XP for Hp. I know I can't migrate my files, addresses, email accounts 5 directly in Outlook Express because 8.1 does not OE use. But I need to keep (as possible) all my accuracy of e-mail on file identity, address and account data and information that I have accumulated ten years... and that's a lot.

I don't understand how this is possible. For example my DSL internet provider has my 5 accounts registered OE [email protected]. How the hell can I create 5 new accounts in my HP to replace 8.1 or mirrored accounts so that I do not lose data and identity and do not have to inform hundreds of contacts that I have new addresses in MS Outlook account or something else? I see things on the web to create a new account in Outlook, but how is it that is related to my 5 OE identities and records?  I hope there are a lot of XP babies like me out there who have good answers for me and thank you in advance. And no thanks to BG you $% & * @# () ^ % $!