How to Open OST File in Outlook 2016, 2019, 2021 & 2024?

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An OST (Offline Storage Table) file is created by Microsoft Outlook when connected to an Exchange or Office 365 account. It allows users to access emails, calendars, and other data even when offline. However, OST files are linked to a specific Outlook profile, meaning they cannot be opened directly in another Outlook account or system.

If the Exchange server crashes, or the Outlook profile is deleted, the OST file may become inaccessible, making it difficult to retrieve email data. To regain access, you need to convert the OST file to a PST file, which can be opened in Outlook.

You cannot open OST file in Outlook directly unless it is converted to PST format. If your Outlook account is active, you can use the built-in Import/Export tool. However, if your OST file is from a deleted account or an inaccessible Exchange profile, using a tool like Advik OST to PST Converter is the best solution. This ensures you can retrieve your emails, contacts, and other data without data loss.

How to Find OST File on Your Computer?

OST files are stored in a specific folder based on the version of Outlook you are using. The default locations are:

Outlook 2019, 2016, 2013, 2010:
C:\Users\<username>\AppData\Local\Microsoft\Outlook

Outlook 2007:
C:\Users\<username>\Local Settings\Application Data\Microsoft\Outlook

To locate your OST file from Outlook:

Open Outlook and go to File.

Click Account Settings > Account Settings.

In the Data Files tab, select the OST file and click Open File Location.

Methods to Open OST Files in Outlook

Method 1: Convert OST to PST Using Outlook Import/Export Tool

If your Outlook profile is active and accessible, you can convert an OST file into a PST file and then open it in Outlook.

Steps to Export OST to PST:

Open Outlook and go to File > Open & Export > Import/Export.

Choose Export to a file and click Next.

Select Outlook Data File (.pst) and click Next.

Choose the folders you want to export and click Next.

Select a location to save the PST file and click Finish.

Once the export is complete, open Outlook again and import the PST file via File > Open & Export > Import/Export.

Note: This method only works if Outlook is functioning correctly and connected to your Exchange account.

Method 2: Using Advik OST to PST Converter

If your OST file is orphaned, corrupted, or from an old Outlook account, you won’t be able to open it directly in Outlook. In such cases, a third-party tool like Aryson OST to PST Converter can help.

Steps to Convert and Open an OST File:

Download and install Advik OST to PST Converter.

Launch the software and click Add OST to upload your OST file.

Choose the conversion option (Convert to PST, Preview, etc.).

Select a destination folder for the converted file.

Click Convert to start the process.

Once converted, open Outlook, go to File > Open & Export > Import/Export.

Choose Import from another program or file and follow the prompts to import the PST file.

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The OST to PST Converter is a powerful, fast, and dependable software that enables you to transfer your email from an OST file into a PST file. The program turns every piece of data from an OST file into a PST file, ensuring that all of the original formatting remains intact as well as making sure all the data is compatible with Outlook or any other email program you may be using.

The program is also capable of preserving the data structures within an OST file (i.e., all of the email components associated with that email, such as the body of the email, all of the attachments associated with the body of the email, and any additional emails associated with that email (calendar, tasks, etc.)), during the entire conversion process to ensure that the integrity of the data is maintained and that the folder structure of the emails remains the same, meaning that the original content of the email will not be altered or lost.

In addition to creating PST files, the software has the ability to create an OST (Offline Storage Table or Exchange) file in multiple formats (HTML, etc.) and thus give the person using the program options to decide how the information is stored for their various applications.
The interface is simple enough that virtually anyone would be able to complete the functions provided by this product with very few complications.

To conclude, the OST to PST Converter provides an easy, safe, fast, and hassle-free way to manage, import, and migrate OST files from any e-mail program (for example, Outlook) to a different one based on user preference. All mailbox data is converted accurately, including emails, attachments, contacts, calendars, etc. Many features make it simple for users with no technical background to migrate data easily without the risk of losing or corrupting any information. Also available for bulk conversions, this tool is especially helpful to those with large amounts of data to move quickly and without much effort. Its ability to work with multiple versions of e-mail programs makes this tool even easier to use. In summary, the OST to PST Converter offers users a reliable and efficient means to perform their email migrations and to manage their data.