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I don't think Bing ever supported https...
Read more at source:A security certificate problem triggered warnings not to use Bing over a secure Web connection Friday, and Microsoft said an issue with network service provider Akamai is to blame.
Browsers displayed prominent error messages and warnings at about 9 a.m. PT when visiting https://bing.com.
...."We're working with Akamai on that. It should be fixed soon," said Microsoft spokesman William Zollicoffer....
Security certificate problem trips up Bing Web site | Security & Privacy - CNET News
I don't think Bing ever supported https...