Aspose Email for .Net version 20.11.0.0
Code sample :
MailMessage mail = MailMessage.Load("testemail.eml");
using (var ms = new MemoryStream())
{
mail.Save(ms, new MsgSaveOptions(MailMessageSaveType.OutlookMessageFormat));
var tmpfilename = "testemail.msg";
File.WriteAllBytes(tmpfilename, ms.ToArray());
}
When opening with outlook, the sent date is Mon 16/11/2020 06:24
Wenconverted to .msg, the sent date becomes today’s date
testemail.zip (3.9 KB)