Microsoft CEO Satya Nadella speaks at the company's Ignite Spotlight event in Seoul on Nov. 15, 2022. Nadella gave a keynote speech at an event hosted by the company's Korean unit.SeongJoon Cho | Bloomberg | Getty ImagesMicrosoft is rolling out an unorthodox pricing model for its new security chatbot that becomes available to the public on April 1.As part of a swarm of generative artificial intelligence announcements last year, Microsoft introduced a preview last March of Copilot for Security,  ...