A word from Intuit. Engineering Project Manager for Quicken Mac 2002, Ed Fernandez: “Quicken 2002 [Mac/OS X] uses the same standards as the Quicken 2002 Windows product for communicating with the brokerages.”

“While theoretically it should be trivial for them to turn on the switch that accepts Mac users, the reason some of them are reluctant to do so has to do with support costs.”
[Archipelago]