... said Windows user Joe Beleaguered, who had lost all his email, business files, MP3s and porn again.
Offhandedly, I've had iTunes remove songs and complete albums on several occasions, actually deleting the files. This has occured under both OS X and WinXP. And an iTunes "upgrade" recently deleted my entire library (again, deleting the files, not just removing their entries in iTunes). Quite a pain in the buttocks.
I much prefer working on a Mac, but I wouldn't trust iTunes with anything of value. It's the only program I've ever had which has done things like this. Windows is annoying, but usually not actively destructive.
Hurray for backups.