To redesign it is a massive, systemic problem. That we were able to do anything for that signaled a shift in engineering's willingness to accept design as part of their process. Marketwise, a massive percentage is Web-driven. I don't think there's one app that can't talk via the Web. But remember, the Web look is basically just a custom look.
Every Web site is different.
It's not using a standard Windows look and feel. The controls have their own look and feel, and they function differently from site to site. A Web UI should follow a similar uniformity like Windows, although it's not at all the Windows look. It's a mistaken assumption that the Web is more usable than Windows. B2B apps are hard to use - harder than Windows.