Apple's iPad sales may be down 23% from this time last year, but the tablet still has a bright future ahead of it in the workplace, Apple CFO Luca Maestri insisted on today's quarterly earnings conference call. Apple is working with outside companies like Box, DocuSign, and ServiceMax to build more business apps for the iPad, Maestri says — a very un-Apple-like move, and one that shows how much the Cupertino company is taking these shrinking iPad sales seriously.