/// The MAPILogon function begins a Simple MAPI session, loading the default message store

  public static extern uint MAPILogon(IntPtr ulUIParam, string lpszProfileName, string lpszPassword,

    Private Shared Function MAPILogon(ByVal uiParam As Integer, _

  uint error = MAPILogon(hwnd, null, null, MAPI_LOGON_UI, 0, ref session);

  /// MAPILogon should only prompt for a password and not allow the user to change the profile name.

  /// If the MAPI_NEW_SESSION flag is not set, MAPILogon uses an existing shared session.