> different filesystems You're looking at the wrong end of it. Dropbox doesn't have to deal with any filesystem, Dropbox instead needs to build a filesystem.

> different filesystems You're looking at the wrong end of it. Dropbox doesn't have to deal with any filesystem, Dropbox instead needs to build a filesystem. It doesn't have to deal with any filesystem because Linux abstracts it. The same abstraction allows it to build its own filesystem really, really easily. How easy? I wrote, mounted, and used a filesystem in less than fifteen minutes. In node.js. It's that easy. > desktop environments Dropbox doesn't need to support various desktop environments, just a stable API for the desktop environments (actually, just file managers) to use. Isn't this how Nautilus, Thunar, Dolphin et al. already support Dropbox's existing features?