The most effective and safe way to convert OST to MBOX is to utilize the Free Online OST to MBOX Converter program. It is one of the most effective ways to convert an Outlook OST file to an MBOX file with attachments. This tool allows you to convert large numbers of OST files at once. While converting, the program can keep folder structure and data integrity. Also, users can convert OST files of any size with no restrictions. The tool can also quickly convert OST to MBOX without changing the original layout.

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