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Microsoft lets brands set up to 40 guidelines for its AI ad copy

Microsoft Advertising now builds a first campaign from a brand’s own files, and an ad has been spotted inside Bing’s AI answers.

By Alexandre S. , 00:45 UTC

Microsoft Advertising’s October update, posted on 28 October 2026, gives advertisers more say over what its AI writes. The feature is called messaging guidelines: a brand writes up to 40 guidelines, such as banned words, a tone of voice or claims it must never make, and Microsoft’s AI uses them to steer the ad copy it writes. It is in open pilot for Performance Max campaigns and for Search campaigns using AI Max, Microsoft says.

Retro-futurist illustration: a striped sunset over a grid horizon under a starry sky, with a software window standing on the horizon.
Drawn by adtestbench from “Build, steer, and measure your campaigns with AI: What's new in Microsoft Advertising this October”,

New accounts also get AI set-up. A new account can hand Microsoft its website and brand material, product photos or a marketing plan, for example. The AI drafts a profile of the business that the advertiser can edit, then builds a first Performance Max campaign from it. Performance Max is Microsoft’s automated campaign type: one campaign, shown across Bing, Copilot, Outlook and more. Conversions API, which reports sales from the advertiser’s own server to Microsoft instead of through a browser tag, is now open to every advertiser.

One screenshot shows a sponsored result inside Bing’s AI Overviews, the Copilot-written summaries at the top of results, Search Engine Roundtable reports. Its editor could not trigger one himself, and Microsoft has not said how those placements are bought, Adriaan Dekker notes.

Brand rules for AI copy are something advertisers have paid copy tools for. Anyword’s Starter plan costs $49 a month with one brand voice, and Jasper’s Pro plan $69 a seat with two, our 30 October check records.

So a brand’s rules for AI copy can now sit, in pilot, inside the Performance Max and AI Max campaigns where Microsoft’s AI writes the ad, while a paid brand voice still covers copy for every other channel.