USA Today reports that in light of a series of embarrassing security issues over the years, Microsoft has changed course and is inviting some of the world’s preeminent computer experts to try and discover holes in the upcoming Vista operating system. On Thursday, August 3, Microsoft made about 3,000 copies of Vista available to security experts in the hope that these experts can help them shore up security issues. Of late, Microsoft has faced a lot of criticism for failing to address these issues with their products…