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There is no easy solution to import OST to Thunderbird. For this, first, you need to convert OST to PST and then PST to MBOX. Now, let’s begin with the process for conversion.
Method 1: Using Import/Export Option
Launch the desktop-based Outlook application on your system or PC.
Navigate to the File menu and click on the Open & Export tab.
Now, tap on the Import/Export option to import the OST file.
In the export to a file option, select the export to a file option and press the Next button.
After that, choose the option Outlook Data File (.pst) and tap on the Next button.
Then, select the folder from which you want to export the data and click on the Next button.
In the next step, tap on the Browse button to find a specific place for the exported file.
Choose the file and press the Open button.
At last, select the other option as per your choice and hit the Finish button.
Method 2: Save OST Emails to PST Using Archiving Method
Outlook emails from OST files are saved within a separate PST file when the Archiving option is enabled. However, Saving the old mailbox things in the archive folder also helps to keep the mailbox size at an optimal level. Follow the simple measures below:
Launch the Outlook application on your system.
Locate the File tab and click on the options tab.
Now, go to the Advanced tab and tap on the Auto Archive settings.
After that, pick the number of days for auto-archiving to run to save the archived file, pick the folder and also provide archiving options. Press Ok.
By the above steps, the mailbox items from your OST account will be transferred to the PST file based on your archiving settings. Now, let us import the PST file to Thunderbird (MBOX) so that the you can complete the process to convert OST to Thunderbird.
Importing Outlook PST File to Thunderbird
Open the Thunderbird application on your system or PC.
Navigate to Display the Thunderbird Menu icon and click on the Tools option.
Now, select the Import tab to import the Outlook PST file.
After that, choose the Mail items and press the Next button.
Then select the file type as Outlook and press the Next button.
At last, your PST file is successfully imported. Hit the Finish button.
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