Within the forseeable future, Bing Chrome and Mozilla Firefox will start distrusting SSL certificates from Symantec, GeoTrust, Thawte, VeriSign, Equifax, and RapidSSL. This modification will need effect whenever Chrome 70 beta and Firefox 63 beta are released in very early September. The stable general public launch of Chrome 70 and Firefox 63 is slated for October. There is certainly a long history between Bing and Symantec which has had resulted in this decision.