To export all emails with attachments from Outlook PST to MBOX format, you can manually use Outlook and Thunderbird. First, configure Thunderbird with your email account. Import PST emails into Outlook, then drag and drop the emails into Thunderbird folders. These will be saved in MBOX format. However, this process is time-consuming and may lead to data loss.
For a seamless solution, use the BLR PST Converter Tool, which exports PST files directly to MBOX format with all attachments intact, ensuring accuracy and efficiency.