In computing, the CRC (Cyclic Redundancy Check) is an error-checking code, which is used by most of the Windows applications including Microsoft Outlook. Generally used CRCs have finite field GF(2). The finite filed generally has two elements, 1 and 0. In some situations, while opening Microsoft Outlook and accessing data from the PST (Personal Folder) file, you encounter CRC errors. These errors indicate PST file corruption and make it inaccessible. In these cases, you encounter data loss problems and require PST Repair.

In a practical scenario, after MS Outlook downloads the emails to your system, you might encounter any of the below given messages:

1-“File path\filename.pst could not be accessed. Data error. Cyclic redundancy check.”
In above error message, the path\filename.pst correspond the file name and location of the PST file for instance, D:\mypst.pst.

2-Data error (cyclic redundancy check)

Furthermore, you might not be able to see and access some of the downloaded emails. When you click the Deleted Items folder, you might come across the below error message:

“Error 0×80040116″

This whole behavior of Microsoft Outlook renders all of your mission critical data inaccessible and critical data loss situations. At this point, you need to find out the cause of this problem and go for PST Recovery by sorting it out.

Root of the issue

This problem generally occurs due to corruption to the Outlook PST file. The PST file might get damaged due to virus infection, power outages, improper system shutdown, application malfunction and other such issues. All these cases make the file unusable and it become essential to resolve it as quickly as possible to gain access of your valuable data.

Resolution

In order to sort out this problem, first check the hard drive for possible errors and then re-create the Outlook PST profile. To do so, go through underwritten steps:

Check Hard Drive for Errors

1-Click Start button, select Run and then type “cmd” in Open box and press Enter key.
2-At command prompt, type chkdsk /f and press Enter key.
Note- If you encounter an error message similar to following one, press Y, press Enter and then reboot the system:
“The type of the file system is NTFS. Cannot lock current drive.
Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)“
3-when disk checking process completes successfully, close command prompt.
4-Start Microsoft Outlook and if the problem remains, go for the next solution.

Re-create the PST (Personal Folder) file

1-Close Microsoft Outlook and then start MS Windows Explorer.
2-Create backup of PST file (Outlook.pst). The location of PST file might be different, depending upon the version of Microsoft Windows.
3-Rename Outlook.pst as the Old.pst.
4-Use Inbox Repair Tool to repair Old.pst file.
5-Create new PST file. For this, follow given steps:
-Start MS Outlook.
-In Create/Open Personal Folder File dialog box, type new file name in File Name text box and click Open.
-Change settings as required, click OK and then Yes button.
6-Import data from the Old.pst file to newly created PST file using Import and Export wizard of Outlook.
7-You might see two PST files in Outlook Folder List. Right-click on one, which represents original Outlook.pst file and click Close on shortcut menu.

The above solutions are helpful in a number of PST corruption situations and can help you to sort out the issue. But in case if they do not work, you need to use third party PST Recovery Software to work around this problem.

These software are specifically designed to thoroughly scan the damaged PST file and extract all of its objects including emails, notes, contacts, tasks, calendar entries, journal and so forth. With self-descriptive and rich graphical user interface, these PST Recovery Software are completely easy to use. They have read-only conduct to ensure safe and original recovery.

Stellar Phoenix Outlook PST Repair is the most advanced and efficient tool to carry out successful recovery in all cases of PST corruption. It supports recovery from the PST files of Microsoft Outlook 2007, 2003, 2002 (XP) and 2000. This software is compatible with Microsoft Windows Vista, 2003, XP, 2000 and NT4 (SP6).

If you are using Microsoft Outlook as your personal email client and information manager, you are using a PST file on your system. PST file is the repository of all your mission critical and precious Outlook data such as emails, notes, contact, tasks and so forth. In order to prevent data loss from the PST file, you must know how to repair it. When PST file gets corrupted, Microsoft Outlook provides you a tool, which might correct the issue without restoring from a backup. This utility is known as Inbox Repair Tool (Scanpst.exe) and is installed on the hard drive when MS Outlook is first installed.How to repair a damaged PST file using Scanpst.exe Tool?

In a practical scenario of PST file corruption and need of Scanpst.exe tool, you might come across below given error message when you try to open an Outlook folder or access data from it:

“Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file drive:\Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook\Outlook.pst. Quit all mail-enabled applications, and then use the Inbox Repair Tool.”

1-The file path, which is specified in above error message, might be different depending upon the version of Windows operating system and Microsoft Outlook that you are using on your system.

In order to repair Outlook PST file, go through underwritten steps:

1-On the Start menu of your Windows desktop, click Run.

2-In Open box, type below string:

drive:\Program Files\Common Files\System\Mapi\LocaleID\scanpst.exe
Here Locale id is the LCID (Locale Identifier) for the installation of MS Office. For instance, LCID for the English (US) is 1033. To see complete information and list of LCID, get Microsoft Office help.

1-Click OK button.
2-In Enter the name of the file you want to scan text box, type the file name and path, which is given in the above error message.
Note- You might not be able to make use of the Browse button for locating the PST file because this is located in hidden Windows folder.
3-In order to change the options of log errors during scan process, click Options button, If you select Append to log or Replace log, the log file would be saved to same folder as the Outlook PST file.
4-Click Start button.
5-When the scan process gets completed successfully, select Make a backup of scanned file before repairing check box.
6-Select Repair option.

If the Outlook Inbox Repair complete successfully and the PST file gets repaired, you would see the Repair Complete message. In the Scanpst.exe tool could not have resolved the problem and repaired the PST file, you would require to use the backup copy of damaged PST file to restore it.

To start using the backup copy o the PST file as new primary PST file, follow given steps:

1-Start Microsoft Outlook.
2-In File menu, click the Data File Management option.
3-Select the Outlook PST file, which is corrupted and then click Remove button.
4-Click Add button, Select Personal Folders File (PST) and then Click OK button.
5-Select the PST that you want to use as new primary file.
6-Click OK button.

Relying completely on the Inbox Repair Tool is not recommended as it can not resolve the corruption scenarios, which are caused by external reasons such as virus infection and improper system shutdown. You should regularly backup your valuable data on a reliable storage media.

But in case if the Scanpst.exe fails to repair the PST file and you do not have complete backup, then you need to go for third party applications. These software are powerful enough to methodically scan damaged PST file and extract all of the inaccessible or damaged data from it. They are known as Outlook Inbox Repair applications.

These utilities do not require sound and prior technical skills to achieve absolute recovery as the come equipped with interactive and simple graphical user interface. Due to read only and non destructive conduct, they do not alter original contents of the file.

Stellar Phoenix Outlook PST Repair is the most effective and widely used pst file recovery application to ensure absolute recovery of PST file. It supports recovery from the PST files of Microsoft Outlook 2007, 2003, 2002 (XP) and 2000. This software is compatible with Microsoft Windows Vista, 2003, XP, 2000 and NT4 (SP6).