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Microsoft Outlook Application is one of the prominently utilized personal information manager worldwide developed by Microsoft. Its main purpose is to provide communication via emails. This information manager provides user to manage all emails, calendars, appointments, journals and other Outlook attributes under one application. When user uses this application all its attributes are stored on mail server and computer. Microsoft Outlook items can be saved in two different Outlook Data files know as .pst and .ost file.  Let us know more about OST and PST file: PST file is Personal Storage Table that is created in computer system by normal users or small companies. Users who use internet service provider (ISP) for network connectivity can save and manage all their Outlook emails, contacts, journals and other attributes in system in an Outlook Data folder called .pst.

Microsoft Exchange Server is an e-mail client that includes e-mail server, email client and contact manager. MS exchange server is widely used in large companies in conjunction with MS Outlook application in order to take advantage of Outlook attributes like calendar, contacts, etc. If user has Microsoft Exchange Server account then all the Outlook items are sent to and stored on the exchange server. Its main advantage is that, it facilitates user to work offline when internet connectivity is not available. When user is working offline, Microsoft Outlook will create replica of user mailbox by name Offline folder with .ost extension. OST is also known as Offline Storage table which will store the offline work and all the changes made in offline mode. As soon as network connection is available it will automatically get synchronized with exchange server and all changes made will get updated. Even if user deletes any of the items from Outlook then it will be removed from exchange server too. Sometimes, you may face issues while accessing or viewing your exchange data. However there are many factors that may lead to OST corruption.

General Scenarios that leads to OST file Corruption are explained below:

  • OST Header File Corruption: The most vital component of OST file is OST header file. It contains important information of exchange file which is must to access it. If this file gets corrupted or damaged due to some reasons then, it may lead to Offline Outlook Data File corruption.
  • Exchange Server Upgradation: To improve email access or performance of existing Exchange Server, administrative can upgrade older version Exchange Server to newer version of server.   During this upgradation process it is possible that OST file present in mailbox may get corrupted.
  • Synchronization Error: Offline Data file automatically get synchronized, when server mailbox is connected to the network and all the modification made in offline mode is updated in server. But if there is any interruption while this process then it may lead to synchronization error messages. Thus synchronization errors can cause Offline Outlook Data corruption.
  • Other Factors: Other Factors that can contribute to OST corruption are sudden termination of system, abrupt Outlook termination and Bad Sectors.

Hence, in all above mentioned cases you can effortlessly fix it by re-building OST file and then converting it into PST by using efficient OST to PST conversion software.

Why OST to PST Conversion Software?

In many organizations, some employees at the time of leaving their present job will delete their Microsoft Outlook account or take Offline Data file with them. The fact is that if they delete MS Outlook account, data will be stored on exchange server. In other condition if they take OST file then data can be accessed using their account that created it. But what if you don’t have any access to computer that created OST file? Is that you won’t be able to view it? At certain times you may need Microsoft OST to PST converter tool which can rebuilt OST file and then convert to Personal Storage file. Thus OST to PST Conversion file for Windows is the best software to get back corrupted or inaccessible Offline Data File.

Convert OST to PST Tool can fix all types of issues related to Microsoft Offline Outlook Data file. It can easily convert inaccessible OST to accessible Personal Storage Table and along with that it can also recover all emails, contacts, journals, notes, calendar, task, appointments and other Outlook attributes. It has inbuilt repairing algorithm which will easily repair and convert an OST to a PST file without modifying the original content of file as it works on read only mechanism. This conversion tool can easily convert password protected OST file to healthy PST file. This OST converter Software has advanced features that will easily convert highly encrypted OST files within few simple mouse clicks. So, it is the best program using which all Outlook users can come to know how to convert an OST file to a PST file with utmost ease. User can even use this tool to convert healthy OST file to Personal Storage Table file as per his convenient use without any difficulties.

Apart from above mentioned features, it is designed in very simple way so that users with less technical knowledge can run it without any professional help in order to convert OST into PST file. Convert OST to PST tool works effectively with all the versions of MS Outlook like Microsoft Outlook 2007, 2010 and 2013. It has the ability to even convert OST file to Outlook 2003 PST, which is the older version of Microsoft Outlook with ease. It can also repair and convert orphaned OST file to Personal Storage Table. This tool is compatible with all the latest versions of Microsoft Windows operating system such as Microsoft Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows Server 2003 and 2008 to convert offline OST to PST file.

Some errors messages you might encounter with OST:

Sometimes user might observe different error messages when attempts to access the damaged or inaccessible Offline Storage Table file. When this file gets severely corrupt due to some general factors then different types of errors come into picture. Let us see some of them:

  • “Cannot open your default email folders. The file xyz.OST is not an offline folder file”.
  • “This message could not be sent. Try sending the message again later, or contact your network admin. Error is [0x80040111-00000000-00000000]”.
  • “Errors in background synchronization. In most cases more information is available in a synchronization log in the deleted items folder”.
  • “Task ‘Microsoft Exchange Server – Sending’ reported error (0x8004060C): ‘The message store has reached its maximum size. To reduce the amount of data in this message store, select some items that you no longer need, and permanently delete them”. 
  • “Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file abc.OST. Quit all mail-enabled applications, and then use the Inbox Repair Tool”.
  • “Errors have been detected in the file. Quit all mail-enabled applications, and then use the Inbox Repair Tool”.

Such above mentioned Outlook errors can be fixed manually. If some errors cannot be fixed manually or occurs due to corrupt OST then make use of Convert OST to PST software to easily convert damaged Offline Outlook Data Files to healthy PST file. It also facilitates users to convert healthy or corrupted Exchange OST to PST file, and to know more about Exchange OST to PST conversion process, visit this page:


Some Safety Measures to be taken to avoid OST corruption:

  • Avoid abrupt termination of MS Outlook application and system.
  • Avoid interruption while synchronization process is going on.
  • Follow proper procedure while Exchange server upgradation.

Recent Updates:

Recover Outlook PST File: Have you ever thought about accidental deletion or loss of PST files from your computer? Well, even if you encounter such a situation, you can recover Outlook PST file within few simple steps using Outlook PST Recovery tool. This tool can restore PST files that are created in Outlook 2013, 2010, 2007, and so on.

Repair Outlook 2013 PST File: Don’t worry if the PST files created using Outlook 2013 application are not opening or got corrupted. Using Repair PST tool, you can repair Outlook 2013 PST file and can recover all attributes from it on Windows 8, 7, and so on.

Convert OST to PST on Windows 8: Is your Outlook OST file corrupted, and do you want extract all it's information on Windows 8? If so, then use Convert OST to PST software as it can efficiently repair and convert OST file PST file from which you can extract all your info. For detailed information, visit:

How to Convert OST to PST in Outlook 2013: Make use of the sophisticated algorithm of this software for converting an OST file into a PST file on Outlook version 2013. For more information on how to convert OST file to PST file in Outlook 2013, visit this link:

How to Fix Outlook.pst Is Not A Personal Folders File?:  If you are getting Outlook PST error i.e. “.pst is not a Personal folders File” then do make use of  Outlook PST Repair Software to solve this issue easily. To know more about this article, log on to:
Repair Broken Outlook 2010 PST File: Make use of most efficient tool called as Repair PST Software to repair broken Outlook 2010 file within few simple mouse clicks. For more details, go through this link:
Convert Orphaned OST to PST: If your Offline Outlook Data file is orphaned due to some reasons then do opt for Convert OST to PST software which will convert orphaned offline file to Personal Storage file along with all its attributes. Visit: to get more information about this article.
How to Fix Outlook 2010 Indexing Issues?: Are you unable to fix Outlook 2010 indexing issues using built-in scanpst.exe tool, then use Outlook Repair software to fix it with utmost ease. For more details, log on to:
PST Repair Tool Not Working: Are you unable to repair corrupt or damaged Personal Storage file with inbuilt repair tool (scanpst.exe)? If yes, then make use of one of the most reliable software called as Outlook Repair tool to repair corrupted PST. For more info, refer this link:
Repair Recovered PST Files: Is your PST file corrupted after recovery process? Then do not worry, just install and use PST Repair software to mend such corrupted files. For more information, you can go through given page:
Repair 20 GB PST File: Repair PST is the best software available in the market to repair 20 GB Personal Storage file without any professional help. Go through this page for more info:
Repair Broken PST File: Do you want to know how to repair broken PST file in Windows system by using Repair PST tool? Do click on the given link to know more about repair process.
Convert Encrypted OST to PST: Utilize most convenient conversion software called as Convert OST to PST to convert encrypted Offline Outlook Data file in to new PST file. Visit to read more about this tool.
OST Error Repair: Do you want to know how to repair errors encountered while using OST? If yes, then no need to worry as Offline Outlook Data File error repair can be easily done by using Convert OST to PST Software. For more info visit:
Repair Corrupt OST File Outlook 2010: If you want to repair corrupted Outlook OST file 2010 then do opt for most reliable tool Convert OST to PST which will easily mend Offline storage table and convert it to PST file. For more info about how convert OST to PST file of MS Outlook 2010, visit this page:
How to Repair Outlook 2003 OST File?: Use Convert OST to PST Software to know about how to repair Outlook 2003 OST file easily and quickly. This software successfully helps you to repair your Outlook 2003 OST file that is corrupted or damaged due to different reasons.

Procedure for converting OST to PST file:

Step 1: - Once you launch this application, a window will emerge that will ask you to pick either "Open OST File" or "Find OST File". Click on the option "Find OST File" if you are not sure about the exact location of the OST file.

Convert OST to PST - Main Window


Step 2: In this step, you will get a screen with the help of which you need to find the OST file. Click on the "Find" option and then hit "Next" option to proceed furthur.

Convert OST to PST - Select Corrupt OST File

Step 3: Soon after hitting on "Next" button the next screen will popup. From this window, select the location where you want to save the converted OST file. Then click on "Convert" option immediately to begin the conversion process.

Convert OST to PST - Select Path for Storing Converted OST File

Step 4: Once the process is completed click on "Finish" button to terminate the process.

Convert OST to PST - Converted OST File