OneDrive's vision is to enable you to share and work together on all your files in a simple and secure way, inclusive of your personal files as well as the files you create and manage in shared space...
Updated May 02, 2018
Version 3.0
Blog Post
Stephen, it's great that the new file viewers have been released, but it would be better if the existing ones were made to work first. Previews of EML or MSG files are still not supported for Chinese, Japanese, Korean, and Arabic languages. In fact, even when email content does not contain any characters from the above languages, if it was sent by a user whose Office or Windows is installed in any of the above languages, the preview will fail because the PDF converter will reject it. EML or MSG files are the types of files that can be displayed in a browser natively, and users would be very happy to look at it this way instead of seeing the "looks like this file doesn't have the a preview we can show you" message. They also don't understand why they get this error message after being able to see the mini preview of the file in its details pane.