Convert OST to PST: OST Converter

In my earlier blog post, I have shared some effective and advanced technique to repair corrupt OST file of exchange server. In this post, I will give you a quick look on “How to convert OST to PST manually?

When you work on MS Outlook, your data files such as- email messages, notes, tasks, calendar, journals and other items are saved on the mail server and in your system both. All the Outlook items are stored in your computer and are kept in Outlook Data File.

Outlook supports two types of Outlook Data File format

 OST ( Offline Storage tables)

It is an offline folder build by Microsoft Outlook and Microsoft Exchange to hold your offline copies of whatever file exists in exchange server. This allows you to work offline or use Cached Exchange Mode when there is no internet connection available in the computer. OST files make it possible to extract the desired folder from a server location and allow you to work with that file contents even when you are not connected to the network (offline). When you get connected, then all the folders get synchronize along with exchange server. This process is known as synchronizing folders.

PST ( Personal storage tables)

It is also known as folders or personal files. It is neither created by Outlook nor the Exchange server. Instead, you can create it and save all your emails, journals, tasks, contacts, calendar entries etc. These PST files can be saved anywhere in your system. It can also be used for archiving file items from any email clients.

POP3, IMAP, and HTTP accounts use PST file format. Additional PST files are created for creating backup or archives of your Microsoft Outlook.

Sometime you ought to migrate your OST file into PST file format. There can be many reasons for converting your OST file to PST format. One of the main reasons for converting your OST file to PST format is when OST file get corrupt. In that case  there is chance of an accidental user account deletion, the server crashes and all  your data gets corrupted and inaccessible,  Converting OST file to PST format performs recovery of email messages, notes, journals, contacts and tasks which are saved in highly corrupted OST file.


  1. Archiving files- 

    You can use Archive to move or copy data to a PST file – this method works well when you have to move almost everything in your mailbox.
    Note – You cannot archive Contacts.


    “Import and Export” is MS Outlook’s inbuilt feature used for converting mailbox data from one client to another. By the help of this feature, you can swiftly convert Exchange Server’s OST file to PST. It also allows conversion of OST to CSV and Excel format.


    Through this method, you can create a new PST file and drag the folders that you want to move to the PST.

    Note: Dragging default folders such as Inbox, Contacts, and calendar, are not possible.  A message will be displayed that you can’t move default folders.


    If you don’t have too many files for converting, then you can email them to your personal email address. Just select the items then right click and choose forward. If you have many OST files, you could drag the files to a new folder in My Documents, then just zip the folder and email that zip file.

Though manually importing of OST to PST file are easy and effective sometimes it does not prove to be a successful way as lots of time OST file gets corrupted.

How to recover Outlook PST file if it is severely corrupted? Click on How to Repair PST File of MS Outlook? and note the steps to execute ScanPST.exe

You can also try a third party tool to recover and convert your OST files. SysInfoTools OST to PST Converter software is a very high-end tool that flawlessly works on your OST files and repairs it. By using this software, You can also easily convert your OST file to many other formats such as- PST, MBOX, DBX, MSG, EML, and Archive. You can visit SysInfoTools website and try its free demo version for an evaluation process.

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