 Software update from cybersecurity firm CrowdStrike crashed countless Microsoft Windows computer systems globally. Both companies have rolled out fixes, systems are being restored. CrowdStrike shares, though, were down 11%. The extent of global damage done by the security patch fiasco underscores just how dominant Microsoft Windows remains throughout the world. StatCounter says Windows, the only operating system hit by today's outage, is installed on 70% of the world's computers.