If you have problems with pst file, you can try a tool called
Advanced Outlook Repair. You can download a free demo version at
http://www.datanumen.com/aor/aor.exe . I think it is a useful repair
tool for you. It is easy to recover your PST file by using its wizard.
It is a powerful tool to recover messages, folders and other objects
from corrupt or damaged Microsoft Outlook PST files.

Detailed information about Advanced Outlook Repair can be found at
http://www.datanumen.com/aor/

Wangdong