KnownBooleanMetadataFieldsUnsent Field

Outlook email object associated metadata field. True if message is still being composed and is treated as a Draft Message object (MAPI property PidTagMessageFlags flag mfUnsent, where if 0x00000008 bit is set - The message is still being composed and is treated as a Draft Message object).

[KnownMetadataAttribute(IsEmailType = true)]
public const string Unsent = "Unsent"