Could you please share your sample meeting.msg file with us for investigation at our end? Also, please try it with the latest version of Aspose.Email for .NET 18.4 and see if it helps.
This shows DateTime.MinValue because the message has not been sent yet. The Date field represents the email sent out date time information which is not available for draft messages.
Can you please elaborate your requirements with respect to this about the Date part? The information being unavailable will always be shown like this as you have currently found.