The original message uses RTF format of body. When message converting to eml, the body is converted from RTF to HTML format. Sometimes complicated formatting is lost during this conversion. When converting to TNEF EML (PreserveTnefAttachments = true), the original message is wrapped into TNEF without conversion. This allows you to keep the original properties, so use of the PreserveTnefAttachments flag is preferable at msg to eml conversion. Otherwise, it may take a long time to fix the conversion of RTF-> HTML, and there are no guarantees that similar problems will not arise in the future.
Please share your feedback whether you are satisfied with the use of the PreserveTnefAttachments flag or exists some reasons (specify please) that prevent you from using this flag.
I have observed your comments and like to share that the issue does not occur when you save first as MSG because in MSG format Outlook uses RTF body without converting to HTML. I hope the shared information will be helpful.
I have observed your comments and an issue with ID EMAILNET-39574 has been created in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issue so that you may be notified once the issue will be addressed.
The issues you have found earlier (filed as EMAILNET-39574) have been fixed in this update. This message was posted using BugNotificationTool from Downloads module by Adnan.Ahmad