I use outlook XP which is linked to my mailaccount.
Now i need to hook up a second account to Outlook. I know this should be possible, but can someone please give me a clue just how to?

goto tools->email accounts and then click the create new user account

you will need to know what type of server type you require, and what the incoming and outgoing server addresses are- unless its a @hotmail/ @msn account in which case outlook kindly does all that for you

Right... that's it. I did the trick before some year ago, just needed a little clue.