Adding an OST file to Outlook can be essential when you want to access previously saved emails, contacts, or other mailbox items offline or after a server change. Here’s a comprehensive guide to help you seamlessly integrate an OST file into your Outlook application.

Understanding OST Files

OST files are offline copies of your Exchange mailbox that allow you to work offline and sync changes with the Exchange server when you reconnect. Adding an OST file to Outlook involves importing or connecting it to your Outlook profile.

Reasons for Moving OST File to Outlook 

Moving an OST (Offline Storage Table) file to Outlook can be necessary for several reasons, primarily revolving around accessibility, data management, and operational efficiency. Here are some key reasons why users may choose to move an OST file to Outlook:

• Offline Accessibility: OST files allow users to access their mailbox data even when they are not connected to the Exchange server. This is particularly useful for users who travel frequently or work in locations with limited or unreliable internet connectivity.

• Backup: By adding an OST file to Outlook, users can create a local backup of their mailbox data. This ensures that even if there is a server outage or data loss on the Exchange server, they can still access their emails, contacts, calendar entries, and other items.

• Server Migration: During migrations between Exchange servers or switching to a new email platform, converting an OST file to Outlook ensures continuity of access to historical mailbox data. This simplifies the transition process and minimizes downtime.

• Faster Access: Outlook often provides faster access to mailbox data stored in OST files compared to accessing data directly from the Exchange server. This can enhance user experience and productivity, especially when dealing with large amounts of data.

• Flexible Working: With an OST file in Outlook, users have the flexibility to work from different devices and locations seamlessly. Changes made offline sync with the Exchange server when connectivity is restored, ensuring continuity and productivity.

How to Add an OST File to Outlook Manually?

Adding an OST file to Outlook manually involves a few steps to ensure that the data within the OST file can be accessed within the Outlook application. Here’s a step-by-step guide to help you add an OST file to Outlook manually:

#1: Locate the OST File

Find the OST file location: Typically, OST files are stored in a specific location on your computer, depending on your Outlook version and settings.

For Outlook 2019, 2016, and 2013, the default location is C:\Users\<username>\AppData\Local\Microsoft\Outlook.

Note down the exact location of the OST file you want to add to Outlook.

Step By Step Guide to Import OST File to PST without Outlook

#Use the Export/Import Tool Method

The Microsoft Exchange account that was used to create the OST file must be used to connect to Outlook to convert an OST file to a PST file. To use this way to save an OST to an Outlook data file, follow these steps: 

Note that the next steps require the same Exchange profile and server connectivity. 

1. Go to Files > Open & Export from there. 

2. Now, choose Import & Export from the menu that drops down. 

3. After selecting Outlook Data File, click Next. 

4. After that, select the folder you want to export, then click the Next button. 

5. Lastly, select the proper choice for duplicate items and navigate to the directory where you wish to save the new Outlook PST file.

Note: An OST file is only available or accessible when linked to the Exchange Server. The OST file becomes orphaned in the event that the connection is lost. This is a fully encrypted file, so no program can open it, not even Notepad++, Adobe Reader, or Outlook. 

Drawbacks of Manual Methods

After discussing the manual methods above, below are a few drawbacks of exporting OST data files to Outlook: 

• System configuration is required for Outlook accounts. 

• Technical know-how is needed to implement the aforesaid methods. 

• Microsoft Exchange Server connectivity is required for the system. This allows for simple OST file exchange with Outlook. 

• Additionally, your data can be lost or tampered with.

Automated Solution to Bulk Add OST Data File to PST Format

Using an automatic third-party solution like CubexSoft OST to PST Converter is usually advised in order to get over all of these situations. It facilitates the transfer of OST files to Live Exchange, Office 365, Gmail, Outlook.com, and more IMAP servers. Along with converting OST files into several formats, such as PST, EML, MSG, and many more, the utility also lets users fix faulty or damaged OST files. 

Wrap Up!

The blog has covered the process of converting an OST file to PST format and then using Outlook's import/export capability to import it into Outlook. However, this method may not be helpful to handle the importing process in the event of file corruption or a missing Outlook profile. Given that the suggested OST Converter program can properly export OST file to Outlook PST format.