"They have over a hundred CGI based apps..." -- my recommendation would be to classify said apps into groups and recognize their differences/similarities. I have seen this before -- some sixty apps that appeared too much to migrate. Upon closer inspection over half of them were derived from the same script(!) with only some variables in the top/preamble section that differed. Assess whether it would be too much work to port all of that to modules. Then, as other responses have mentioned, consider whether that centralized code would be best hosted remotely and delivered as a service on Linux or similar.
Celebrate Intellectual Diversity
