For one thing the mere act of compression of data into the PST file often results in lost emails. The PST file itself suffers from size limitations and will allow spillage of file when the inbox is over stuffed. Further, simple scanning of these messages when being downloaded by an antivirus program can result in the files being damaged.
Any and all Outlook repair needs can be easily met by using REMO PST Repair. This is the most powerful PST recovery program ever made and it will uncover any messages you may have lost using Microsoft Outlook. Outlook often requires corrupt inbox repair and this REMO software is built for that as well. When you need help with mail recovery from Outlook this is the software to choose.