How to Migrate OST Files to MSG Format Efficiently?

I am currently facing a challenge with migrating multiple OST files from Microsoft Outlook to the MSG format. The situation is that I need to extract important emails from offline OST files, but Outlook doesn’t provide a direct way to convert OST to MSG. I am looking for a reliable method or tool to perform this migration without losing any data, including attachments and email properties. Has anyone successfully performed OST to MSG conversion? What approach or software did you use, and are there any precautions I should take to ensure data integrity?