I needed to test a Exim mail server from my Windows 7 laptop a little while ago and was surprised when I typed telnet I received an error. The error indicated that the telnet client was not installed on my laptop which seemed odd since I have Windows 7 Ultimate. I assume that telnet in general is being phased out of most operating systems in general however it is a great tool for troubleshooting. After a little digging around in the Windows Programs Control Panel I was able to easily install telnet. Follow the directions below to install telnet on your Windows 7 computer.