Computers and Technology

Best Methods to Convert OST to PST file – A Complete Guide

In the offline (Cached Exchange) mode, Microsoft Outlook saves all the Exchange mailbox data in a local OST file. When a user edits an item in offline mode, those changes are later synchronized to the server mailbox when the Exchange connection is re-established. Because this file resides on a computer, it is unaffected by issues related to Exchange Server crashes and disasters, Exchange mailbox deletions, etc. Therefore, the OST file can be used to restore user mailbox data on the occasion of such eventualities.

Microsoft Outlook is one of the popular email client and it has many benefits but at the same time it has some limitations too. One such limitation is the capacity of this email client and it can’t store large amount of data. As a result, if you want to increase your mailbox size then you need to convert OST to PST file.

Reasons Behind of Converting OST to PST

There can be several reasons why you might want to convert your OST to PST file. Maybe you’re switching from one email client to another and need to migrate your data.

  • A few users’ mailboxes were deleted from the Exchange server.
  • A user wants to restore the deleted mailboxes before deletion.
  • An Exchange user has corrupted his OST file and wants to rebuild it before saving his unsaved data.
  • The EDB files are inaccessible due to Exchange corruption or a server crash, but users want their emails urgently.
  • Current email client is no longer supported and you need to find a new one that can open PST files.

Whatever the reason, there are a few different methods you can use to convert your OST to PST.

  • One method is to use a dedicated OST to PST converter tool. These tools are designed specifically for converting OST files and can be very effective.
  • Another method is to use a general manual methods.

Manual methods are not specifically for converting OST files, but they can still get the job done. They may not be as effective as dedicated OST to PST converters, but they’re often.

Method 1: Export mailbox as a PST file

There are a few different methods that you can use to convert an OST file to a PST file. One popular method is to export the mailbox as a PST file. This can be done using Microsoft Outlook.

To move your Outlook data to another computer or an archive, follow these steps:

  1. Click File > Import & Export.
  2. Choose Export to a file; then click Next.
  3. Pick the second option (.pst) and click the Next button.
  4. Select the folder(s) you want to export and click Next.
  5. Browse the location where you want to save the new PST file and choose an option regarding duplicate items.

The method that you choose to convert your OST file to a PST file will depend on your personal preferences and the amount of data that you need to convert.

If you only have a small amount of data to convert, then exporting the mailbox as a PST file using manual methods might be the best option for you.

However, if you have a large amount of data to convert, then using a third-party tool might be the better option.

Method 2: Use ‘Archiving’ to save OST emails to PST

There are a few different methods that can be used to convert OST to PST files. One method is to use the ‘Archiving’ feature in Microsoft Outlook. This feature allows you to save emails from your OST file into a PST file.

To auto-archive your e-mail, follow these steps:

  1. Launch Microsoft Outlook and go to File > Options.
  2. Select Advanced and then Auto Archive Settings.
  3. Set the number of days you want to keep your archived e-mail in the dropdown menu.
  4. Choose where you want to save your archived e-mails (all folders or just the Inbox).
  5. Under “Archive options,” choose how you want Outlook to sort messages during archiving (by date or by sender first).
  6. Finally, click OK to close the Auto Archive Settings dialog box and apply your settings.

Another method that can be used to convert OST to PST files is to use a third-party conversion tool. There are different conversion tools available in the market.

But, first, we will discuss what are the limitations of manual methods while performing conversion of OST to PST file.

Manual Methods Limitations

  1. Users must have Microsoft Outlook installed on their computers. Without the software, conversion is not possible.
  2. There is a high chance of losing the data if the user does not follow all steps correctly.
  3. The manual process is hard to implement for non-tech users.
  4. It takes a lot of time to perform the conversion.
  5. There is a risk that if the user skips any step, the conversion will not perform.

Overall, manual methods can be useful in some situations, but they have their limitations. If you need to convert an OST file to PST, it is best to use a professional converter tool.

Method 3: Professional Method to Convert OST to PST

The most important thing to keep in mind when converting an OST file to PST is to make sure that all of your data is preserved. This means that you’ll need to use a method that is 100% reliable.

One of the best methods to convert an OST file to PST is by using a professional converter tool. This type of tool is designed specifically for this task and can be used to quickly and easily convert your OST file.

Sysinfo Tools OST to PST Converter can do multiple tasks such as users can easily convert an OST file to PST format. It allows exporting OST emails, contacts, journals, tasks, and notes to Outlook PST files. It supports all the available versions of MS Outlook and Exchange Server and other formats like PST, MBOX, EML, EMLX, HTML, CSV and MHTML. The software also offers a trial version, which converts the first 50 email items.


There are a few different methods that you can use to convert an OST file to PST. In this article, we have outlined the best methods for doing so. We hope that you find the method that works best for you and your needs. If you have any questions, please feel free to visit the official website of Sysinfo Tools.

Read more: Export Gmail Emails to Hard Drive

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