> You could do a review of both lists and use something similar to compare
> the resulting files on another system

Easiest low-tech way to do this is to concatenate the subscribers from
REVIEW ALL output of both lists, hand-snipping out everything else, and dump
the whole thing into a sort. The MS-DOS interface, or "Command Prompt"
accessory on Windows, has a sort built in.

But if you write any programming language and have facilities to run it on
your computer, you can improve on that. Perl is probably best (easiest to
use, most versatile, and best adapted to handling output from email commands
to the server), and it's available for free. Good old C or C++ will do it.
Heck, write it in Javascript embedded in an HTML page with an input form.

If you aren't a programmer and have to run a list, I recommend you find a
programmer to help with this sort of thing.

Hal Keen