Re: you pay 7 bucks for a coffee?
Serious question - under which rock you're living in a yankland ?
Excel is a swiss knife type tool every accountant knows on a level you would not master in years. By the way that's exactly same accountant that can easily quantify loss of productivity from switching to new "free" piece of junk and I can safely guarantee you that it will be few orders of magnitude more than $7.
Your only hope after that is management won't notice that 3.5 inch USB drive you brought Libre office on as it would cause significant pain on both ways in and out of your dumb ass. So you'll be better off using USB sticks.