Bug in interpreting units in UnitConvert

I get the same result on my Macbook Pro running v10. Note when using the Palette or Keyboard shortcuts in Palette for Inputting Typeset Units and Package with Input Aliases you can see what is happening. The issue is the interpretation of “MicroMeter” which somehow becomes mm of Hg. Mathematica does work correctly when you use “Micron” but “MicroMeter” should work.