If you use Microsoft Outlook in an Exchange or Office 365 environment, your data—including emails, contacts, and calendar events—is stored in an OST (Offline Storage Table) file. But what happens when you need to access your calendar outside Outlook, or recover events from an inaccessible OST file? In such cases, knowing how to extract calendar from OST files becomes essential. This guide will walk you through everything you need to know to make a backup of your Outlook calendar, retrieve it from an OST file, and ensure your schedule stays safe—whether you’re switching devices, migrating accounts, or recovering from corruption.

Understanding OST and PST Files

Before diving into how to extract calendar from OST, it’s important to understand the two main Outlook data file formats: OST (Offline Storage Table) and PST (Personal Storage Table).

• OST File: This file is automatically created when you set up Outlook with an Exchange, Office 365, or IMAP account. It allows you to work offline and syncs changes with the server once you’re back online. However, OST files are tied to a specific profile and can’t be easily imported or opened on a different system.
• PST File: This is a portable Outlook data file used for backing up or archiving emails, calendars, contacts, and more. Unlike OST files, PST files can be opened and imported into Outlook on any system.

To back up or migrate your Outlook calendar, you’ll often need to convert OST to PST, especially if the original Outlook profile or server is unavailable.

Why Backup the Offline OST File?

• OST files can become corrupted due to system crashes, Outlook errors, or sync failures. A backup ensures your calendar and other data are safe.
• With a backup, you can recover events that were deleted or lost from your Outlook calendar.
• When switching devices or accounts, you may need to extract the calendar from OST and move it to a new setup.
• In case of account deactivation or server issues, a backup allows you to access your calendar outside of the original Outlook profile.

Methods to Extract Calendar from OST File

When it comes to Outlook, the calendar is one of the most valuable components of your data. If your account becomes inaccessible or you’re switching devices, you’ll need a reliable way to extract calendar from OST files. Below are the most effective methods to do so:

1. Using Microsoft Outlook (If OST File Is Accessible)
2. If you still have access to the original Outlook profile:
3. Open Outlook.
4. Go to File > Open & Export > Import/Export.
5. Choose Export to a file > Outlook Data File (.pst).
6. Select the Calendar folder.
7. Choose a destination to save the exported .pst file.

How to Extract Calendar from OST File?

If you want to export a calendar from multiple OST files or only be required to export a maintained calendar as appears in the OST file. So, we recommend you to opt Jagware OST Converter as this software is capable of restoring damaged, inaccessible, corrupted, and orphan OST files and allows export into multiple formats such as ICS, PST, PDF and many more.

1. Download automated software on your system then launch it.
2. Click on configured Outlook mailbox data and press Next button.
3. Choose OST mailbox folders as you want to export.
4. Browse file format in the list of Saving options.
5. Set destination path and browse advanced filters as needed.
6. Now, Click on Next to start extracting the calendar from the OST file.

Benefits of Automated Approach

• This software offers a simple initiative interface to easily perform by any professional or individual users.
• You can also convert OST to CSV, EML, PST, PDF, MBOX and many more export features.
• With this wizard, you can also use modern filter features as per date range, subject, sender, recipients etc.
• It also offers to import OST to Gmail, Thunderbird, Outlook.com, Yahoo and all IMAP Supported email platforms.
• This software also offers preview folder options to select OST folder or subfolder as you want to export.

Conclusion

In this guide, we have explained completely effective approaches to extract contacts from OST files by manually and using expert recommended approaches. If you have configured an OST file with Outlook then you can perform it manually. Otherwise, we recommend you to choose automated software as it offers fully maintained results without losing any information.