When I got my first Intel MacBook Pro, I purchased a license of Parallels Desktop, which was then pretty much the only game in town for PC virtualization on Mac OS X. At some point, when I got my Mac Pro, I switched to VMware Fusion because of the initial bugginess of the Parallels 4.0 initial release, and the competitive upgrade was almost free. When I upgraded to Snow Leopard, I switched back to Parallels because Fusion doesn’t work when you boot Snow Leopard in a 64-bit kernel, which I have now made the default on my Mac Pro (Fusion 3.0 was just announced, with 64-bit kernel support).

Pretty much the only apps I run in Parallels are:

• Microsoft Money 2001 (I need to write a webapp to replace this)
• IE8 (for testing purposes only, of course)
• EAC (sometimes gets better secure rips than Max)

When I installed Parallels 4.0, I was shocked by how much integration between the Windows VM and OS X is enabled by default. I don’t trust Windows one whit, and the last thing I want is for a Windows VM to become a vector for Windows malware to infect my Mac. I disabled all the integration features, and only access Windows files via file sharing where OS X gets to read and write Windows files, but the Windows VM stays securely sandboxed in its ghetto. Hideous Windows icons in the dock are also a distraction.

Parallels and VMware have been focusing on adding integration features to their virtualization products. They probably believe there are few performance optimizations left to be achieved, but if they continue with reckless disregard for security and the contamination of the OS X user experience with Windows ugliness, I will have to switch to VirtualBox, as its spareness looks increasingly like a virtue.