You can repair your inaccessible Outlook PST file by using a repair tool which is built-in tool in Outlook to repair the corrupted PST file aka Scanpst.exe. Scanpst.exe file is installed while the time of installing Microsoft Outlook. This file is stored in this location: drive:\Program Files\Microsoft Office\Office12/14
Double click on Scanpst.exe file and follow the instructions. It will solve your problem.