Back in the days, the net send command-line tool used to be quite popular among systems administrators and let’s be fair, it used to run smoothly and fulfilled a purpose. Though, I have seen many instances where it was used to prank users with fake messages like ‘hi, the system has detected that you have a low IQ. Please consider upgrading for better performance’. Since Vista, Microsoft introduced the message (msg.exe) command-line tool instead, which like the net send worked like a charm. However, in Windows 7 the MSG command may fail to send a message and returns an ‘Error 5’ message.