06-25-2025, 08:01 PM
To convert Microsoft OST to MBOX, you need a third-party OST to MBOX converter tool because Outlook does not support MBOX format natively. First, download and install a reliable tool like TrustVare OST to MBOX Converter. Open the software, load your OST file, preview the mailbox items, and choose MBOX as the output format. Then select the desired folders and start the conversion. Once completed, you can import the MBOX file into supported email clients like Thunderbird, Apple Mail, or others. This method is quick, safe, and requires no Outlook or Exchange connection.