How to Fix Corrupted Outlook OST File?

Offline Storage Table simply called as OST file, is a Microsoft Outlook storage file. Benefit of OST file is that it allows users to continue their work on Outlook even if the application is disconnected from Exchange Server or in offline mode. You can compose new emails, save them in drafts, read or delete existing mails etc. Once the internet connection is retrieved, whatever changes you have made to the Outlook OST file gets automatically synchronized with Exchange Server. Actually, OST files are carbon copy of mailbox lying on Microsoft Exchange Server and are stored in computer hard drive. Therefore, damage to Exchange Server does not affect OST file saved on your hard drive.

But several times, you may get error messages while synchronizing your Offline Folder file (.ost) in Microsoft Office Outlook. Sometimes you might also notice that some of your items are either deleted or missing from OST file. It usually happens due to any human mistakes or OST file corruption. So if you suspect that your OST file is corrupt, then you need to use OST Integrity Check tool (Scanost.exe) to fix your MS Outlook OST file.

OST Integrity Check tool

The OST Integrity Check is a built in repair application used to diagnose and repair OST file. The tool works by scanning both your OST and mailbox file running on Exchange Server. It compares items and folders in each file and attempts to resolve synchronization differences between them. To use this tool you must be connected to your Exchange account server.

Fixing errors using Scanost.exe

  • Terminate MS Outlook before starting repair process
  • Open Scanost.exe by double clicking on it, the default location is at drive:\Program Files\Microsoft Office\OFFICE12
  • If you have multiple Outlook accounts, the tool will prompt you to choose the OST file that you need to repair
  • If you are asked to Connect or Work Offline, click Connect
  • Choose the option according to your need
  • Select “Repair Errors” checkbox to automatically resolve errors while scanning OST file
  • At last click “Begin Scan”

Nevertheless, if Scanost.exe fails to repair your corrupt Outlook OST (Offline Storage Table) file, you need not get upset!! You can fix it by using reliable third party software like Yodot Outlook PST Repair. This tool is among the best repair utility to fix your OST file corruption due to any reason. The best thing about using this software is that after repairing OST file, it recovers all deleted or lost items like emails, Attachments, Notes, Journals, meeting requests, etc. from Outlook OST file. The tool scans corrupted OST, copy its content to new file and fix issues; thus it never intact your original file.

Along with OST, the tool supports to fix PST file when it is corrupted. And while moving your PST to another physical location through USB drive, things can go wrong making your pen drive corrupt. In such instances instead of thinking why my pen drive is corrupted and unreadable you can make use of Yodot data recovery product to reach your PST and other files on USB flash drive with utmost ease.

How to use the software?

  • Download Yodot Outlook PST Repair and install the software on your computer
  • Open the software and follow main screen procedure
  • Use “Open PST File” option to browse for your corrupt OST file which is to be repaired
  • Click on “Find PST File” option to search for the OST file
  • Select “Outlook Profile” option to choose for a particular Outlook profile if you have multiple Outlook accounts
  • Select “Normal Scan” method to fix your OST file with minor corruption or choose “Smart Scan” method to fix your severely corrupted OST file and click on “Repair” button
  • The application initiates the repairing process, after which it shows all the recoverable items in Outlook styled interface

Things to be noted:

  • Close all MS Outlook elements before the repair process
  • Never exit your Microsoft Outlook application improperly
  • Use a quality antivirus program to remove virus from your system
  • Backup your OST file regularly

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