Your messages in your inbox are stored on you hard drive in the following location:
(Below refers to my main drive as E: and my username James Venning)
E:\Documents and Settings\James Venning\Local Settings\Application Data\Identities\
there should be a folder in "Identities" that has a string of characters, mine is:
click on it, then click on "Microsoft" and finally "Outlook Express". Your messages are archived into .dbx format.
A quick search in Google gave me "DBX Exract Tool" which will extract the messages from the .dbx files. The program is located here
Hope the above helped!