On October 28 2026 Microsoft Advertising opened an open pilot that lets advertisers give its AI up to 40 written guidelines for ad copy. The update adds tighter compliance and performance control to its automated Performance Max campaigns, helping brands steer messaging and see results.
What happened
Microsoft Advertising announced a suite of October updates in a blog post titled Build, steer, and measure your campaigns with AI: What's new in Microsoft Advertising this October. The headline feature is an open pilot that allows advertisers to supply up to 40 specific guidelines telling the AI what ad copy should and should not say. The pilot joins other October rollouts such as age and gender targeting, auction insights for Performance Max, and a new AI-assisted setup flow that builds a first Performance Max campaign from a website and brand documents. Several items, including audience exclusions and device targeting, remain in pilot or are slated for release in the coming weeks.
Why it matters
Performance Max campaigns have been praised for automation but criticized for opacity. By letting marketers define up to 40 messaging rules, Microsoft gives advertisers direct control over brand voice, regulatory compliance, and prohibited content. The same update also adds more reporting; search-term mapping to landing pages starts mid-November, so marketers can see exactly how AI-generated ads perform. Together, the controls and transparency address long-standing advertiser concerns that automated copy can drift from brand standards or legal requirements.
What this means for marketers
Marketers can now steer AI output with granular rules, reducing the risk of off-brand or non-compliant messaging. The ability to upload brand guidelines, marketing plans, and product images into the campaign creator creates an “editable snapshot” of the business that shapes ad copy from the start. For agencies like ADFLU, the new messaging guidelines complement its verified lead generation service, ensuring that AI-crafted ads attract high-intent leads while staying within strict brand parameters. Early adopters should request pilot access through their account team and test the guidelines on a limited budget before scaling.
"Leaning into AI only pays off when you can steer it and see what's working" Microsoft Advertising blog
The bottom line
Microsoft’s October pilot gives advertisers up to 40 AI ad guidelines, more performance reporting, and new targeting options. The changes promise tighter brand control and clearer insights for automated campaigns, but they are still in testing phases. Marketers who need strict compliance should explore the pilot now and monitor rollout timelines for full availability.
Sources
- 1.ppc.land