While you are correct that a virtual PC for Windows is necessary on a Mac for some accounting functions, there are two key issues which can be handled quite well on the Mac operating system. Microsoft makes a version of its Remote Desktop software for the Mac allowing Mac laptop users to access their PC systems remotely. As far as accounting software for the Mac, AccountEdge (formerly MYOB) has been supporting the Mac OS operating system for twenty years and functions quite well handling write up and other client applications.