What are the Methods to Convert OST2PST Files?

To maintain the efficiency of managing accounts from different email servers, MS Outlook creates two separate kinds of data files – OST and PST. OST file is the offline file that replicates the online contents from the PST file. The email servers that create OST files are IMAP, Exchange, outlook.com, etc. The synchronized data in the OST file is saved in the local computer and whenever the connection is broken from the server or you have opened Outlook in airplane mode, then the OST file makes the mailbox content accessible and usable.

All the previous items that are downloaded like emails, contacts, calendar, tasks, will show and you can read the compose new emails too. But new emails will remain in the outbox until the connection is resumed. Additionally, you can create new contacts and add appointments too. All the changes will be synchronized once Outlook is connected with the related email server.

Why is the user required to convert OST 2 PST format?

OST file remains in the local computer at OST file default location and there are various unavoidable circumstances when the file is corrupt or becomes disconnected from the application. To manage these situations, you must convert OST2PST format and retrieve data into it. Here are some common reasons that clear the air about OST2PST conversion —

  • MS Exchange Server has crashed due to malware or spyware attack, abrupt shutdown, hardware failure, power outage, etc. If you are facing an error (1206 JET_errDatabaseCorrupted, 501 JET_errLogFileCorrupt, 1022 JET_errDiskIO / Disk IO error) while accessing the account, then you should convert the data file immediately.
  • Each Server has to face downtime due to maintenance or upgrade. So, if you want to access your mailbox data during such a period, then conversion is the answer.
  • If the OST file is corrupt, then you convert it into a healthy PST file.
  • Migrating data is secure in the PST file format and you can import it easily in the Outlook application.
How to convert OST2PST data file?

Outlook offers different methodologies to save contents into a PST file. If you are using Exchange or Office 365 accounts, then your default data file is OST and you can export or archive it into PST format.

Export the OST file to PST

Outlook can export data from any kind of account to either PST or CSV file format. Follow the below steps-

  1. Click the File option and go to the Open & Export section. Now, click Import/Export.
    Click Import/Export
  2. Import and Export wizard is opened. Click the ‘Export to a file’ option.
    Click Next.
    Click the ‘Export to a file’ option
  3. There are two options for saving the data file – Choose the Outlook Data file (.pst) option.
    Choose the Outlook Data file (.pst) option
    Click Next.
  4. Now, you can choose any mailbox and apply the filters to it. You should also click the checkbox to include subfolders. Click Next.
    Click the checkbox to include subfolders
  5. Click Browse and choose a folder where you want to save the PST file. Furthermore, choose the Options to manage duplicate items while exporting the data. It can allow, replace, or skip duplicate items. Click Finish.
    Replace, or skip duplicate items
Archive the account in PST format

Outlook offers to create an archive mailbox that can contain older contents from another account. The archive mailbox is saved separately in PST format.

  1. Open Outlook Options wizard and go to the Advanced section. Here, you should click the AutoArchive Settings button.
    Click the AutoArchive Settings button
  2. There are several settings to apply for archiving the items. You can choose the days interval in which the Auto archive will run. After applying the settings, Click the Browse option to save the archive data in a folder. At last, click OK.
    Browse option to save the archive data in a folder

A new archive file will be created in the PST format. You can use this PST file to access older data from the mailbox.

Final Words

The manual approach to convert OST files to PST will work for a single account’s mailbox and with limited data too. If you want better results, then you should use a professional OST to PST Converter software as it will process faster and convert multiple OST files at the same time.

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While using Best OST to PST software, there is no requirement to take any external assistance to run the software and there is a simpler user interface to use the features. You can access all the OST files from various accounts like Office 365 or Exchange Server and convert them simultaneously in PST format.


  1. Conversion of OST file to PST format is a tedious task, but because of this fine solution I converted OST file to PST format. After hearing my successful conversion my colleagues also try this.

  2. I converted OST file to PST format with the above solution, it helped me in the whole process. Every step is clearly mentioned and tips are is to apply. I recommended this solution to my colleagues, their experience with this method was also amazing.

  3. This amazing method helped to shift OST file to PST format with email, attachment, contacts etc. This method takes more time if files are large in size. So it is advised always use this manual solution for small size file. With technical expertise your work made super easy.

  4. I tried this method to convert OST file to PST format with all details of mailboxes. The free manual method has all the tricks which I needed to get the right result. I also recommend this solution to my fellows who also have amazing experience with the solution.

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