how to convert .dbx to .pst

i am using outlook express 6 at my office on a windows xp sp2, at home i just bought a new laptop with windows vista preloaded in it. i understand that outlook express is now windows mail, but when i try to import my old messages, which i put in my new laptop through a usb drive copying all the .dbx files expcept for the folders.dbx it dosent show any files that can be coppied. also i came to know if i convert my .dbx files to .pst files i would be able to copy my old mails to the new windows mail. please help.

also i had a doubt, if i want to install microsoft outlook express on a vista, would it work? and from where can i buy a microsoft outlook express?

thanks,