Well, although chances aren't that great these days, I've come across some users who stay using the older version of mirc for some reason. Some even use 6.12, which frets me..
In my experience there are two main reasons why people use these old versions.
One being that people use cracked copies or fake keys and want to avoid the verification introduced in later versions.
The other being that they use (outdated) add-on scripts which use old mIRC executables (and are incompatible with newer versions).
Then of course there's laziness.
