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This blog post will explain – what is OST file, reasons behind the corruption issues, solution to repair corrupted files and convert into multiple file formats. Microsoft one of the most widely used email application that has multiple advanced features with respect to other email application. The OST or Offline storage Table enables the user to access and send/receive email items even when the user is disconnected with internet. All the changes in the OST file made by the user gets updated in the mailbox server when the internet connection is re-established. One of the major limitations of OST file are can’t be access/import into any other outlook profiles. However, the PST or Personal Storage Table is an online file folder that can easily access/import into any other outlook profiles.

Reasons of corrupted OST file:

There are various factors behind the corruption issues in the Outlook OST file that are listed below –

  • When Exchange Server crash down.
  • Oversize OST file.
  • Improper termination of system & outlook.
  • Sudden power outage.
  • Weak/Abrupt internet connection.
  • Storage media failure.  
  • Incompatible outlook add-ins.
  • Malicious/Virus attacks. 


Read More: How To Fix Outlook Crash Error in Send & Receive Process


Before utilizing manual workarounds for repairing of corrupted OST data files, let’s know the main reason behind why most of the IT-professionals and IT-experts recommend us to utilize third-party tool over the manual workarounds. The manual workarounds is completely free tricks to resolve corruption error but having various drawbacks that disturb the user while conversion and after the conversion process. 


The following drawbacks of manual tricks are – 

  • It is unable to repair if the OST file highly corrupted.
  • Convert only single OST file items at a time.
  • Unable to export Batch OST file.
  • Required technical skills for conversion OST to PST.
  • Risk of permanent mailbox data loss.
  • More risk of error from user sides.

Repair and covert corrupted OST file – Third party Utility ATS OST Recovery Software

After knowing the limitation of manual methodology, the user are confused in selection of best third-party tool. Don’t worry, just download the top rating solution by the IT-experts that named is ATS OST Recovery Toolkit. This toolkit has made-up of latest advanced algorithm/programming that provides an interactive and user-friendly GUI to the user to easily handle this toolkit. The following key features of this toolkit are listed below –

  • Automatically scan entire OST data and repair all the corruption issues.
  • Restores all Outlook items from corrupted, inaccessible, encrypted and password-protected files.
  • It recovers all outlook items such as – tasks, calendars, deleted items, notes, drafts, contacts, etc.
  • This toolkit provides a preview option to view the recovered data from OST files.
  • Export bulk OST file to PST format simultaneously.
  • Selective option is available in this toolkit, the user can easily export only desired items by clicking on the Selective option.
  • The software allows us to convert OST file into multiple file formats – PST file, MBOX, PDF, MSG, MBOX, vCard, vCal, NSF, EML, EMLX files.
  • It is capable to maintain the original hierarchy of folder structure while the conversion and when the conversion process is over.
  • Directly migrates OST data file into cloud-based application Office 365 and Live Exchange Server without any difficulties.
  • Supports all the editions of MS-Outlook and OS Windows including – latest & older editions.

How I can Convert OST to PST format 

  1. Download the ATS OST to PST Converter and open it.
  2. Click on the Open File button and to select the OST file.
  3. Now, the preview of recovered mailbox data will appears on your screen.
  4.  You can select single or multiple items as per your requirements and click on the Export option.
  5. After that, Browse the destination path and select the desired formats.
  6. At last, click on the Convert button to start the conversion OST to PST.
  7. Click Batch Converter Button to Convert Multiple OST files and Recover Mailbox data.
  8. Click Office365 or Live Exchange Button to easily Export offline OST File to Cloud Server.

The Final-Words


To conclude, we have discussed an excellent third-party toolkit that has various advanced features. This toolkit is completely risk-free solution which provides money-back guarantees within 30 days of software purchase. For checking the working capabilities of this toolkit, just utilize the free demonstration Demo Pack that enables you to convert the first 30 email items from each folder is totally free of cost