Inbox Repair Tool is capable to fix a minor level of PST corruption issues, but to repair highly damaged PST files, you should try a third party Outlook PST repair tool. The software also allows you to recover deleted or inaccessible Outlook mailbox items without any hassle. It supports almost all versions of MS Outlook, including latest MS Outlook 2016. For more information, visit: http://www.free.pstrepairoutlook.com/
However, scanpst.exe is limited to fix only header or minor corruption issues. Sometimes it may fail or not work if corruption is extreme. In such situation, you should try a professional Outlook PST Repair Tool reliable and safe utility to recover and repair personal storage table files (PST) of MS Outlook. Once repair is done, it restores the contents on the new retrievable PST file.In this recovery, all the information is included in data file, like attachments, emails, calendar items, contacts, notes and journals. Free Version Available Now !
There are many software vendors in the market which provide PST repair or recovery tools with demo/trial version for free evaluation. So before you can purchase any such paid software, first you must download free demo/trial version. By using demo/trial version, you can check the preview of your mailbox content which you can actually recover from the corrupt PST file before paying for the software. If you're satisfied with the results, then only you should purchase the software.