In my final post on this issue for now, Mark Pilgrim responds to John Gruber and makes some excellent points about long-term data retention. As someone worried about data life, I really should have been thinking about these things when I wrote my post. I’m still kicking myself for saving all my music in AAC rather than MP3 (since still no one but Apple is really supporting AAC), not to mention all the old documents in various formats that I can’t open anymore. Conclusion: good arguments all around, Mark’s are more compelling, in my view and coming from my specific mindset, but may not be more compelling to others, and still on balance I am sticking with the Mac and just doing what I can to avoid lock-in to proprietary formats.