https://www.reuters.com/article/us-usa-cyber-microsoft/more-than-20000-u-s-organizations-compromised-through-microsoft-flaw-idUSKBN2AX23U

More than 20,000 U.S. organizations have been compromised through a back door installed via recently patched flaws in Microsoft Corp's email software, a person familiar with the U.S. government's response said on Friday.