Inbox Repair Tool Fails with Unknown Error to Access the PST

Published: 20th October 2009
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PST files are used for storing Outlook data. If Outlook fails to open or results errors when you try to access mail folders, chances are that you Outlook data file (.pst file) is corrupted. The Inbox Repair Tool is a built-in utility provided by Microsoft that can deal with some of these corruption problems. It can repair the PST file, if it has been corrupted by Outlook itself or some hard disk issues have rendered the file unusable. To deal with other Outlook PST Repair tasks, third-party applications can work. However, it is recommended to apply the backup, provided is available and valid.

Consider you use Microsoft Outlook and .pst file corrupts for some reason. As the prime solution, when you run Inbox Repair Tool to try fixing the corruption issues with the file, you receive the similar error as below:

" An unknown error prevented access to the file C:Documents and SettingsUSERLocal SettingsApplication DataMicrosoftOutlookoutlook.pst"

Trying to open the same file with hex editor also fails with the below error message:

"Couldn't open 'C:Documents and SettingsUSERLocal SettingsApplication DataMicrosoftOutlookoutlook.pst' for reading."

When you attempt to copy the file, it results into CRC erros and you cannot copy it.


Such errors suggest that .pst file is severely damaged, beyond repair. Inbox Repair Tool comes with limited functionalities to repair the damaged file. It analyzes the file for fixing directory structure and item headers issues.

You can encounter these PST problems if the disk is infected. Hardware related concerns can also prevent any file to be opened.


You are suggested to follow these measures to solve the above problem:

1-Run chkdsk to diagnose and repair disk issues
2-Perform hardware diagnostics to determine and isolate hardware issues, if any
3-If none of the method works for you, it is highly recommended to use third-party PST Repair applications.

Outlook PST Repair tools are comprehensive tools, exclusively designed to diagnose and repair a corrupted PST file. These products are safe to use and prove completely efficient to bring results, even when the Inbox Repair Tool fails to fix.

Stellar Phoenix Outlook PST Repair is a reliable and advanced repair utility for PST files created with Outlook 2007, 2003, 2002 and 2000. It is one of the known PST Repair product that is competent to restore all file objects, including emails, notes, journals, tasks and contacts. The tool incorporates high-end scanning algorithms and graphically rich user interface.

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