Unable to restore data PST from old hard drive

Hi dude,
My motherboard & CPU went south on me, so I decided I would pull my 2 hard drives out of my PC and install them in external hard drive cases (which worked very well). I then set up a new Windows XP pc (my old one was 2000 running outlook 2003).
The new pc recognized my external drives and I proceeded to try and find all of my email (PST) files on my old hard drive. I cannot find any of my current email anywhere, Except for some archive files there are no PST files. Does anybody have a solution to where I should be looking?
Thanks.
