Some one who has deals with top 5 orgs on Earth gives zero shits about the software or who made it, as long as it gets the job done. Actually, they might care, in a sort of "Yes, Virginia, there is a Santa Claus" sort of way, but if you're on deadline and there are jobs on the line, people paying rent, you really can't afford to worry about whether Office costs you $100/year every year for the rest of your life.