French site Mobinaute has a video and screenshots of a device running Access Linux Platform - the successor to, ah, er, to the Cobalt version of the PalmOS that never saw the light of day. Watching the video, I'm pretty far from quaking in my boots. In fact, I'm pretty far from my keyboard right now because I'm afraid that soda will come shooting out of my nose as I laugh at the UI-lags, mis-matched dialog boxes, terrible PalmOS emulation, and so on.
To be fair, the OS hasn't been put on any devices designed for it and isn't even finished yet. But if this video is any indication, Microsoft doesn't have much to fear from Access.