Yahoo Messenger Monitor Sniffer is a System Utilities software developed by IMMonitor Software. After our trial and test, the software was found to be official, secure and free. Here is the official description for Yahoo Messenger Monitor Sniffer: Yahoo Messenger Monitor Sniffer is handy network utility software designed to capture and observe Yahoo Messenger conversations on all computers in a network. It is able to record conversations automatically in real time. And export all intercepted messages to HTML files for later processing and analyzing. It is very easy to make it to work, and it will monitor all conversations in your Local Area network without the use of client software installed on the remote computer. you can download Yahoo Messenger Monitor Sniffer free now.