https://www.liberkey.com/forum/
1 - Right click on Office Starter menu shortcut (beforehand manually created)
2 - Application property -> Advanced tab
3 - Set parameters : taskkill /IM <Office.exe *32>
4 - Apply changes
At Liberkey close, choice to force closure (no risk if you saved previously your documents)
P.S : Tested under Windows 7 64 Bits