Not everyone's a product visionary, but you need a way to manifest your vision to get everyone on board or rally the troops. Sometimes it's an email, presentation, speech, or prototype. For a company with over 100 corporate executives listed and over 10,000 employees attending its global sales conference, it's not unreasonable for Microsoft to be using video. Large orgs are as much about politics as they are about products, and you need to champion your idea to others.