You might want to use something more professional such as steller pst repair tool rather than scanpst.exe. It's a bit expensive but works fine. The problem with scanpst.exe is that it can only fix .pst files smaller than 2GB and sometimes damage the file totally. So using professional products is very good idea in this context.
Hope that helped...
Answered Aug 01, 2011
Edited Aug 01, 2011