Bing, Microsoft Copilot and IndexNow - the Forgotten Ecosystem Feeding AI Answers

Microsoft Copilot has over a billion monthly active users (as of April 2026), and every time someone asks it a question that needs current knowledge, the system fires off a search against the Bing index in the background, pulls candidate pages, and builds its answer with citations from them. If your page isn't in that index, you don't exist to Copilot - no matter how well you rank in Google. The same applies substantially to ChatGPT, which for years relied on the Bing index for its search mode. And yet the vast majority of companies in Poland haven't even set up Bing Webmaster Tools.

On July 1, 2026, Fabrice Canel, Bing's longtime head of crawling and indexing and the chief architect of the IndexNow protocol, retired from Microsoft. It's a good moment to notice how much of today's AI-generated answers actually run on the infrastructure he built. The whole SEO world is debating Google AI Overviews, while Microsoft Copilot entirely, and ChatGPT substantially, pull sources from the Bing index - and since February 2026, Bing itself shows you when you're being cited. Here's how the ecosystem works, how to configure it, and how much traffic it actually delivers.

This post closes out the "per platform" series on AI search visibility. Ranking in Perplexity and SearchGPT covers Perplexity's RAG pipeline, and optimizing for Google AI Overviews and AI Mode covers Google. Microsoft's ecosystem - Bing, Copilot, and the IndexNow protocol - is the last of the major channels still practically uncovered by most companies, despite costing the least time of all of them.

Bing isn't a "small engine" - it's hidden infrastructure

Globally, Bing holds around 4.3% of search share - that's true, and it's exactly why most SEO teams ignore it. But that same Bing entirely powers Microsoft Copilot (over a billion monthly users as of April 2026) and substantially powers ChatGPT Search. On top of that comes its desktop share (nearly 8.8% globally) and its US share (8.7% as of June 2026) - segments where B2B decision-makers often sit. The number of direct Bing users is small. The number of AI systems pulling data from it is enormous.

Who actually pulls from the Bing index (and it's changing)

The picture that used to be simple - "ChatGPT and Copilot run on Bing" - needs an update in 2026. Independent analysis of ChatGPT's server traffic has revealed OpenAI's own internal index (known as Labrador), a family of vertical indexes - web, PDF, YouTube, news, academic papers, Wikipedia, and more. In instant mode (free ChatGPT, answer in a few seconds), the system relies mainly on its own Labrador index, not Bing. At the same time, OpenAI's official documentation still lists Bing and Shopify as data sources, and independent researchers have also confirmed traces of Google index usage - undisclosed by OpenAI.

The practical takeaway: the idea that "covering Google is enough" was never true for AI visibility, and in 2026 it's doubly false - because even ChatGPT, associated purely with Bing, increasingly builds answers from its own index alongside Bing and Google at once.

Bing Webmaster Tools, step by step

Setup takes less than an hour, and most companies skip it:

1. 1.Verify your site. The fastest method: if you already have Google Search Console connected, Bing automatically imports ownership and sitemap data when you sign in with a Microsoft, Google, or Facebook account. Alternatively: a meta tag, a DNS CNAME record, or an XML file.
2. 2.Submit your sitemap.xml. In the Sitemaps section, paste the full sitemap URL and confirm. This speeds up crawling of your important pages.
3. 3.Enable IndexNow (covered below) - the cheapest lever in the entire Bing ecosystem.
4. 4.Check the AI Performance report, launched in public beta on February 10, 2026 and expanded in June 2026 with intent labels, topic groupings, and comparison tools. It's the only major engine that shows first-party, for free, when and how often your content is cited in Copilot and Bing's AI summaries - with citation counts, "grounding queries" (the search phrases Copilot generates internally to retrieve data for an answer), and trends over time.

IndexNow - instant indexing, and why Google sits this one out

The IndexNow protocol, launched in October 2021 as a joint effort by Bing and Yandex, solves a simple problem: instead of waiting for a crawler to stumble onto a changed page on its own, you send a single HTTP request with the URL and an API key, and it's instantly shared with every participating engine at once. As of 2026, participants include Bing, Yandex, Naver, Seznam, and Yep. The effect: new or updated content often gets indexed in minutes or hours instead of days or weeks.

Adoption grew steadily: in August 2022, Microsoft's Fabrice Canel reported that 7% of all new URLs clicked on in Bing came from IndexNow submissions. By March 2024, that share had grown to 17%. This shows that for real Bing traffic (and indirectly, Copilot traffic), IndexNow stopped being a curiosity and became a primary discovery channel for new content.

Google, despite testing the protocol since 2021, still doesn't support it as of 2026 - it says only that it's "monitoring" adoption, with no commitment. It maintains its own crawling infrastructure and a separate, heavily restricted Google Indexing API (limited to job postings and live-stream content). The practical takeaway: implementing IndexNow costs nothing (one submission reaches several engines at once), and its absence from Google means you still need to rely on a sitemap and normal crawling there.

Ranking differences: Bing vs. Google

Bing Webmaster Tools' official guidelines list six ranking factors: relevance (how well content matches query intent), quality and credibility (author and site reputation, level of discourse - Bing explicitly demotes content with offensive language), user engagement (CTR, bounce rate, dwell time), freshness, location (country, city, hosting, language), and page load time. This is a list similar in spirit to Google's factors, just weighted differently - in practice, a page well-optimized for Google usually does reasonably well in Bing too, as long as it has correct structured data, good performance, and is actually indexed.

How much traffic does Microsoft's ecosystem actually deliver

A sober calculation: direct traffic from the Bing search engine itself, at a ~4.3% global share, is a relatively small number for most companies. But that's the wrong measure of this channel's value. The right measure is: the cost of implementation (Bing Webmaster Tools plus IndexNow is under an hour of work, no license fees) weighed against the fact that this is the only path to being cited in Copilot's ecosystem of over a billion monthly users, and one of the paths to being cited in ChatGPT. For a company that already has solid Google SEO, the marginal cost of covering Bing is close to zero, and the marginal benefit - access to the entire Copilot ecosystem - is disproportionately high.

A deployment checklist

1. 1.Create and verify a Bing Webmaster Tools account - import data from Google Search Console if you already use it.
2. 2.Submit your sitemap.xml and wait for the first full crawl.
3. 3.Implement IndexNow - one API submission with every content publish or update.
4. 4.Enable and regularly review the AI Performance report - treat it like Google Search Console for Copilot citations.
5. 5.Check your structured data and page performance - the same fundamentals that work for Google also work for Bing.
6. 6.Don't treat this as a one-time project - crawling and indexing in Bing needs the same hygiene as Google: a current sitemap, no 404/500 errors, consistent structured data.

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I set up and audit visibility across the whole AI ecosystem - Google, Bing/Copilot, ChatGPT and Perplexity at once - with citation measurement and a real priority plan. I do this as part of AI optimization (GEO) and technical SEO. Reach out - I'll check whether your site is even indexed in Bing, and how much you're actually losing by ignoring this channel.

Worth reading next:

• Ranking in Perplexity and SearchGPT
• Optimizing for Google AI Overviews and AI Mode
• How to get cited in ChatGPT
• Crawl budget - how Google indexes your site
• AI traffic analytics for ChatGPT and Perplexity