OK. The primary application that I need Windows for is Quickbooks Enterprise. I also still use my Windows Photoshop license since it was expensive, and not transferrable to OS X. My primary operating system is already OS X, and I only use Debian Stable on servers. I run Windows in a VM when I need those application, and only when I need those applications. How would you suggest replacing Quickbooks Enterprise? Do I just stop keeping accounting records? What about the 13 years of records that are already in the accounting system? Should I throw those out? What about inventory and accountant's copies? Will you train my customer's accounting firm to use some other package? What about the inventory database?