it also discovered that many companies consider it a deal-breaker to lose the functionality that the Outlook-Exchange combo provides
Isn't that the same as saying that companies like the functionality and are willing to pay for it?
I could certainly understand the point if it had said that they are not willing to lose the current interface or not willing to lose the training time already put in, but saying they are not willing to lose the functionality is the same as saying it is good software, they are willing to pay for it, and they are not willing to switch until someone can come up with something actually better.
Work continues in this area. -- DEC's SPR-Answering-Automaton