>>If I was a betting man I'd take that bet. The problem is not the tool set but the functionality that is very niche to our industry and mathematically complex, not to mention our demanding client base that has used our product since 1980's and know its functionality as much as we do and demand very little loss of features in the re-writes.
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>Our clients are the biggest mutual fund companies in the world with billions in assets and they are as demanding as any customer. We cannot lose ANY functionality or speed. So far our product conversion has given them what they want.

A large mutual fund company based in Pennsylvania by any chance? If so, I have a buddy who works in IT there.