Bing announced that starting July 31st, 2017 they will stop supporting the creation of new and editing of existing standard text ads. Advertisers will only be able to create or edit ads using the extended text ads format.
Bing did add that "all your existing standard text ads will continue to serve alongside expanded text ads for the foreseeable future." Bing does eventually plan to stop supporting standard text ads sometime in the future but will give advertisers ample warning and time on when they have to make those changes.
Bing then shared on their blog some tips on making ads or converting ads to the extended text ads format.
Basically, this is your wake up call, start migrating those standard text ads sooner than later because that is inevitable.
Forum discussion at Twitter.
