 They're starting to recover and get back online after that massive IT outage yesterday. It was caused when security company CrowdStrike issued an update, but it knocked out Microsoft systems. So how can businesses lower their risk of an outage like this, putting them out again? Security experts we spoke with say corporate IT departments should really consider diversifying their network security between multiple companies. So if there's a problem with one of them, it won't take down all of their computers at once.