You may securely convert OST files to MSG format without Outlook by utilizing special software OST to MSG converter tools such as FixVare OST to MSG Converter. These applications save all the email's information (subject, sender, recipient, date, attachments) and make sure that no data is lost during the conversion. The software easily converts OST emails to MSG format without losing any emails during the conversion process. The tool is a good option for everyone, and the free sample allows you provide the first 25 emails in each folder.

Converting OST files to MSG format without losing email data is a common need when you want each email saved as an individual file — especially for archiving, legal discovery, or migration purposes. Simply opening the OST in Outlook and dragging messages to a folder can work for smaller mailboxes, but this manual method often risks missing items or losing metadata such as attachments, timestamps, and sender/recipient details. A more reliable and secure approach is to use a professional conversion tool that is designed to handle OST files safely and maintain data integrity throughout the process. Tools like the Cigati OST to PST Converter  allow you to load your corrupted, orphaned, or inaccessible OST file and export its contents directly to various formats, including MSG, while preserving the complete structure and details of each email. This ensures that nothing important is lost in translation — attachments, formatting, headers, and other message properties remain intact. Using such a dedicated solution simplifies bulk conversion, avoids manual errors, and gives you a dependable way to convert OST to MSG format with full data retention.