This is the killer feature of tools like emacs and vi: Your vendor cannot abandon you and the code has a well-proven capability to be ported to just about any platform.
The cross-platform aspects of these tools is way undersold. I have all my config checked in at BitBucket. I can sit down at a new machine, check out my emacs configuration, tweak a couple variables if things are non-standard on the box (paths and the like), and I've got my environment completely set up, whether Mac, Windows, Linux, or something else.
