/// The MAPIReadMail function retrieves a message for reading.

  public static extern uint MAPIReadMail(IntPtr lhSession, IntPtr ulUIParam, string lpszMessageID,

   Public Shared Function MAPIReadMail(ByVal lhSession As IntPtr, ByVal ulUIParam As IntPtr, ByVal lpszMessageID As String,

  /// MAPIReadMail does not mark the message as read.

  /// If the messaging system does not support this flag, MAPIReadMail always marks the

  /// message as read. If MAPIReadMail encounters an error, it leaves the message unread.

  /// MAPIReadMail should not copy file attachments but should write message text into the

  /// MAPIReadMail ignores this flag if the calling application has set the

  /// MAPIReadMail should read the message header only.

  /// MAPIReadMail should write the message text to a temporary file