Outlook

I have a problem with outlook in one of the pcs in my company. There are about 5 PCs connected to Microsoft Exchanged in the NTSERVER. All runs well until I replaced one of the PC’s with a new one. The new PC’s alright but the emails in another PC (lets call it PC X) gets deleted automatically in the inbox. Everything in PC X’s inbox just went missing and I couldn’t locate the mails.

Any solutions to this??