Messenger Detect 4.06 is available as a free download on our software library. This PC program was developed to work on Windows XP, Windows 7, Windows 8 or Windows 10 and is compatible with 32-bit systems. The most popular versions of the Messenger Detect 4.0, 3.9 and 3.8. MessengerDetect.exe, Detect.exe, MDetect.exe, MDServ.exe or mdsniffer.exe are the default file names to indicate this program's installer. This software was originally produced by formessengers.com. The program is included in Communication Tools.
From the developer:
Messenger Detect - the chat monitoring software that can monitor and record all popular Instant Messenger chat and web chat* on your local network automatically and secretly.
You may want to check out more software, such as Y!Hook Messenger, Fastlife Messenger or Gap Messenger, which might be similar to Messenger Detect.