I have a different case with the same version but 32-bit variant on my Windows 8 Notebook (Dell).
My system has i5 CPU M520 @2.4GHz with speed stepping enabled.
- As soon as I start Lync it is forcing the CPU to run at its high speed/power consumption mode i.e at 2.4GHz.
- If I quit Lync CPU operates nearly at 1.5Ghz without changing any other load on the CPU.
This makes the battery to dry sooner. somehow I didn't like Lync 2013 as it doenst sync with my outlook calendar, etc.!
Before and After: Took this snapshot after lync is settled..