Hi, I think Magus OST to EML Conversion tool is a reliable solution to convert OST files to EML format. The tool can easily export OST files to EML format to access OST emails in Mozilla Thunderbird, Windows Live Mail, Lotus Notes, Windows Mail, Microsoft Outlook 365, etc as per the user requirements. Data security and hierarchy of the folder are always maintained during the process. It exports all the details associated with a mail. Also, it helps you to download the attachments separately if needed.
For more info, visit the Link: Convert OST to EML with Magus OST to EML Conversion Tool
Thunderbird has long been better than outlook
https://addons.thunderbird.net/en-US/thunderbird/search/?q=export+eml&appver=&platform=
Just look up the addon that works for importing exporting your mailbox.
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Are you want to convert OST files to EML format then you will need a secure method to do this conversion process simply. Users can download the BLR OST Converter Software to directly convert any size OST emails with attachments to EML file format. There are users can download this software in any Windows OS edition. No need to install multiple software to convert OST files to EML file format. Try the free trial edition of this software to learn more features and functions about this software.