My inbox disappear from the folder list in outlook express, the other folder are there

My inbox disappear from the folder list in outlook express, the other folder are there normally.

I searched for the outlook express folders and I found it, in that folder it has two inboxes one named inbox.dbx its size is 42 mb, and the other is named inbox(1) only with few bytes.

Did anybody know a free tool to repair a .dbx file.

Thanks