Microsoft Outlook stores data in two files – OST (Offline Storage Table) and PST (Personal Storage Table). OST files are most commonly referred to as the replica of the Exchange mailbox. When Outlook is configured with Exchange Server in cache-enabled mode, OST is created.

On the other hand, PST files, often called as Outlook data file is used to store emails and other important data in your computer. However, there are several reasons that arise in front of users due to which they need to transfer data from OST to PST. In the following write-up, we will discuss multiple ways to convert Offline OST file into PST format.

Need Behind OST to PST Conversion

The main reason, which comes up for the need of OST file to PST migration is corruption of the OST file, which leaves it inaccessible. The OST file is by default encrypted and as a result, the user needs to have an authentication before accessing the file.

OST files are mainly used when a user wants to work in an Offline mode. As soon as the user gets online, the OST file synchronizes with the Exchange server. At the time of the synchronization, the encryption key for the profile is matched with the key that is saved on the server. If both the keys match, the synchronization takes place otherwise the OST file become inaccessible. This mismatch in the encryption keys can occur due to profile recreation. In addition, other reasons like deletion, recreation, and relocation of mailbox lead to mismatching of the encryption key.

Thus, this leads to a potent need to export OST file into PST format.

Methodology to Convert OST to PST

Method 1: Export from OST file into PST

Before beginning the process of conversion, Outlook must be there that is running on the machine. While converting the data, users must remain connected via Exchange Server. If there is improper connectivity with Exchange server, then it is not possible to utilize offline profile. There are few steps given that makes easy to migrate OST to PST file format.

Step 1: Open MS Outlook on your machine.

Step 2: Then, go to File menu and choose open & Export option >> Import/Export option.

Step 3: Choose an option of Export to file and press Next button.

Step 4: Select PST >> click Next button.

Step 5: Choose one by one for converting data items that are required.

Step 6: Store all the data items at specific location on your machine and click on finish option after completing the procedure.

Method 2: Archive OST into PST

This method is useful in case users need to convert OST to PST archive with all data items like calendars, mails, etc. into Online PST file. AutoArchive gives an option for selecting the days after which they need to archive data. To archive Exchange OST Files follow mentioned steps:

  • Open MS Outlook in your system.
  • From menu bar, choose Tools option.
  • Choose Options.
  • From option dialog box, select other tab.
  • In the second section, select an option of AutoArchive >> click Ok.
  • In the option Run AutoArchive after selection of every number of days.
  • Select the preferred location to save the AutoArchive file and click Ok.

NOTE: The archive feature fails to archive contacts from Outlook OST files.

Method 3: Move Items into New .pst File

Users can migrate mailbox data items from OST to PST file. For this firstly, there is a need to create new PST file in MS Outlook. After that, drag all folders from Outlook OST file, which are required to convert one at a time in newly created .pst file.

NOTE: It should be kept in mind that by utilizing these procedure users will not be able to move the default folders of Exchange OST file such as inbox, contacts, calendars, etc.

Trouble-Free Method

The aforementioned methods do not guarantee safe data conversion of your OST file. Therefore adopting a third party tool would be a smart step in order to carry out the conversion. One such application, which comes in this category, is OST to PST migration tool. The main features that these kind of tools exhibit are:

  • Convert the inaccessible OST file into PST format.
  • Supports conversion of corrupted OST files.
  • Migrate OST file to PST in batch without data loss.
  • Split PST option to split resultant PST file.
  • Meta data is kept intact during conversion.


For the continuity of the work, it is important to perform the data migration from OST to PST file format. In the above-discussion, we have discussed various solutions to convert Offline Exchange OST file to PST format that makes easy for users to perform conversion.

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Diptesh Kumar Bhakat is proud to be the author of fastest growing tech blogs. He is a tech-savvy, SEO Expert, SMO Expert, SMM Specialist and a professional Blogger. Except blogging, he is so much found in photography, superbike riding. He has a very close attachment to the tech world and loves to blog on his fav topics. He has also contributed to many regional dailies and authored guest posts on some of the leading tech blogs. Professionally, he is a tech blogger and reviewer. he is a very energetic person who constantly puts up an evil smile to counter any obstacle in his manner. This dude is highly unpredictable and in reality, you can’t recognize what’s coming from him…be it his articles, generating an aura, or his personality. Mr. Diptesh is completed his B.Tech in Mechanical Engineering, as everybody thinks about one question that how a mechanical engineer can make a website?? Is it strange!!!!!!!! Yes it is. But there is a big story we will update soon.


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