How to open OST file in Outlook 2016 Offline?

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Are you trying to open OST file in Outlook 2016 Offline? Worry not, as this blog will cover some simple ways to open OST files in Outlook 2016. If you’re considering doing so and are concerned about the security of your mailbox’s contents, we’ll show you how to open OST files in Outlook.

Offline Storage Table (OST) is an encrypted Outlook data file, is created when a new Outlook account is created. It is linked to a certain profile on a specific PC where your account is set up. If you have an MS Exchange account and want to work offline, you can use Outlook Data Files (.ost). In the event of a down server or unstable internet connection, they are quite helpful.

Which conditions affect OST files?

  • When a virus affects the system.
  • Power interruption while transferring files
  • The amount of storage space is running out.
  • When file synchronization encounters a network problem.
  • A bad sector exists on the hard disk.

If you’re unable to open OST file, it’s possible that your OST file is corrupt, but don’t worry—you can easily recover your data using the manual techniques described below. 

Manual method to open OST file in Outlook 2016 Offline

In order to use this method, certain requirements must be met.

  • Installation of MS Outlook 
  • Active Outlook Account

1. Open Microsoft Outlook. Select Import/Export from the File menu.

2. Select Export to File from the list of possibilities. choose Next

3. Click Next after selecting Outlook Data File (.pst) from the list of possibilities.

4. Select the mailboxes you want to export from your mail account.

5. Select the subdirectory, then click Next.

6. Mention the location of the file on your system using the Browse button.

7. Press “Finish”

You can password-protect the exported PST file. This step is completely optional. You are free to go. This is the complete process to export OST mailbox items to PST files.

Automated method to open OST file in Outlook 2016 Offline

You can easily convert an inaccessible, orphaned, or corrupt OST file to PST, EML, MSG, MBOX, HTML, PDF, NSF, and other formats using SysInspire OST to PST Converter Software. The software will allow you in exporting all mailbox items such as emails, contacts, notes, calendars, tasks, etc. into PST format without any loss of data. You can even perform the conversion without installing MS Outlook. The best part is that you can export multiple OST files into PST format at once while viewing complete data preview.

Steps to convert OST to PST with SysInspire OST to PST Converter Software

1:- Download and run SysInspire OST to PST Converter software on your computer, then click “Choose OST” button to load OST files.

2:- Scan and repair corrupted or damaged OST files, then extract all their internal emails, contacts, tasks, calendars and other mailbox items.

3:- From the preview panel, you can see the preview of OST file with all mailbox items and choose which folders to convert.

4:- Then, from the available formats, choose PST, MSG, EML, EMLX, HTML, and others to export your OST file.

5:- Then click “Convert” button to start the process of OST file recovery or conversion to PST and other formats.


It is clear that OST files cannot be opened directly in Outlook, we have provided a solution to open OST file in Outlook 2016 by converting them to PST files. In this post, we propose two methods to convert OST to PST file format. You can try both methods and choose the one which works best for you. However, it is recommended to use a third-party tool as it considers exporting all types of OST files directly to PST, Office 365, and other formats.

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