 Cyber security firm CrowdStrike said on Sunday that a significant number of the 8.5 million Microsoft devices impacted by Friday's global tech outage are back to operational. There are still reports of airlines, hospitals, banks, media companies, and other businesses having trouble getting back online. A botched software updates to blame for the outage. CrowdStrike stock dropped 15% on Friday, marking one of its worst ever days on the stock market.