can't see imported mail's after importing from outlook exp..

I just imported my outlook express folders & e-mails, however i'm unable to
see any old e-mails, folders are there but no emails. My computer crashed i
have my hard drive in a enclosure and connected to my new PC as a local
device. what do I have to do too see my old meails? i see the folders but
they are empty or how can i transfer, i try importing from Windows mail but
getting, no messages can be found in the folder or another application is
running that has the required files open. ......