
Inbox repair tool is an application provided by Microsoft along with the Office suite. This is located by default in your Program Files. As the name itself specifies, this tool is used to repair the PST file when it is corrupted. This helps to troubleshoot only the minor corruptions in the PST file. The header of the PST file may get corrupted when you upgrade Outlook. The inbox repair tool starts to repair from the header and will reset the file structure and rebuild the headers of the file. Microsoft inbox repair tool is not a powerful recovery tool to repair the severely corrupted PST file.
Common reasons for the corruption of the PST file are
The size limit of the PST file in case of Outlook 2002 is 2 GB. As soon as the PST file exceeds 2 GB, it is prone to corruption. The size limit of the PST file however has been changed in the later versions of Outlook. It is updated to 50 GB in MS Outlook 2010. After this enhancement in the PST file too, it is subjected to corruption when you don’t organize the emails in separate folders and clean up the emails and compact the PST file periodically. This might decrease the chances of corruption and prevent the PST file from exceeding the maximum size limit. There are many other causes for the corruption of the PST file like improper exit of Outlook, virus attack etc. The essential precaution that is to be taken to repair corrupt or oversized PST file is to use the inbox repair tool. There are various reasons due to which Inbox Repair Tool stops responding. One of them is size limit of the PST file and the other is severe corruption of the PST file. In such cases, the Inbox Repair Tool fails to fix the issue and it becomes essential to use a pst repair utility to fix the issue.
By using Remo Repair Outlook (PST), you can repair the severely corrupted PST file, which makes sure that the PST file is not further corrupted by creating a new PST file. This software is built with advanced algorithm and is a comprehensive PST repair tool that will recover Outlook data.
When you download the free trial version of the software on your system, a short cut icon appears on your desktop. Just double click the icon and a main window appears as follows. You need to select from the three options available as shown in Figure a.

Based on the options you have selected in the previous window you have to proceed as follows
Open PST file: When you choose this option, you have to click on the Browse button to select the PST file that is to be repaired as shown in the figure.
Find PST file: You can choose this option to select the logical drive on which you have to find the PST file that needs to be repaired as shown in the screen shot.
Select Outlook profile: If you choose this option, all the PST files that are associated with Outlook profiles are displayed as shown in the screen shot. Based on the displayed Outlook profiles select the PST file.
Click “Next”, then select “Normal scan option” and destination location of the PST file where you want to store the recovered Outlook data.
Click on “Repair” button to start the scanning process and after completion of the scanning process, you can view the recovered Outlook data.

Once, satisfied with the results, you can buy the full version of the software.
More Info..
Inbox repair tool for Windows 7
Inbox Repair Tool for Outlook Express
Inbox Repair Tool for Outlook 2007