Google and Microsoft trade insults for April Fools

April Fools' Day provides the springboard for companies to make some unbelievable announcements, but for Google and Microsoft, it serves as the perfect time to poke fun at eachothers' shortcomings. With Gmail Blue, Google is teasing Redmond over a product that doesn't officially exist yet, while Microsoft goes back to basics to poke fun at its rival's "vanilla" search engine.