Email introductions are infinitely easier for introverts than picking up the phone, and "with the Internet, you can connect with hundreds, thousands, or millions of people without ever leaving the house." A white paper is easily shared and debated without having to fly somewhere to make a presentation.
Organizations can also actively take steps to help their introverts feel comfortable. Cain suggests that companies "should think really hard about their office design" and create places where "people can have personalization and privacy" without a huge conference room reservation process. "You shouldn't have to sign up to be by yourself."
And even rethinking meetings can help. "Make sure to give people ways to contribute that aren't just to jump into the fray." Something as simple as handing out an agenda of a meeting in advance will give introverts "time to think it through." And since introverts are often energized by such thinking, they'll probably have great ideas to contribute -- if you bother to listen.