Thunderbird cannot directly import OST files because it does not support the OST file format used by Microsoft Outlook. OST files are encrypted and tied to specific Outlook profiles, making them incompatible with other email clients like Thunderbird. However, you can easily overcome this limitation by using a reliable tool such as the Advik OST Converter. This software can transfer OST files into Thunderbird. It has a dual mode that enables you to import single or multiple OST files at once.
- Run the tool on your system.
- Add .ost file into software.
- Choose mailbox folders.
- Select Thunderbird as a saving option.
- Click Convert button to begin the process.
In this way, Thunderbird import OST file.
