Mapping Microsoft Mobile Mouse 4000 Back / Thumb Button

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http://askubuntu.com – I can't seem to find how to map the thumb ( back ) button on my Microsoft Mobile Mouse 4000. Everything else I need on it works, but when I run xev it doesn't register the thumb button. For reference, it also doesn't register the wheel tilt buttons, but I don't use those so no need to map them. It seems odd to me that on Windows on the same computer all the buttons work yet xev on my Ubuntu 12.10 VM doesn't capture those three. (HowTos)