I wonder how much time and money they would save if they had just bitten the bullet and rewritten the entire thing in PHP in the first place instead of doing what they did.
The big advantage of the ASP/VBScript version is that there were almost no dependencies and it would install on the most basic IIS setup. Many companies already had IIS installed and configured but not doing anything.
Getting companies to install PHP on Windows (a dicey position those days) was a non-starter.
