# How Does Microsoft Copilot Choose Its Sources?

> How does Microsoft Copilot choose its sources? Comparison with ChatGPT and AI Overview. Optimize Bing index, schemas, and content structure.

Canonical: https://www.wearefrank.fi/en/how-copilot-chooses-sources/
Published: 2026-03-22
Modified: 2026-03-22

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Microsoft Copilot chooses its sources from the Bing search index, prioritizing structurally marked, fresh, and authoritative websites.

## How does Copilot's source selection differ from other AI searches?

Copilot relies on the Bing index, while ChatGPT uses both its own database and Bing search, and Google AI Overview uses Google's own index.

## What does the Bing index require from your website?

Getting into the Bing index requires three basics: a working XML sitemap, Bing Webmaster Tools registration, and a technically functional website.

## Which schema markups affect Copilot visibility?

The most important schema types for Copilot optimization are Organization, Article, FAQPage, and HowTo.

## How to optimize content as a Copilot source?

1. **Ensure Bing indexing:** register in Bing Webmaster Tools
1. **Schema markup:** add Organization, Article, and FAQPage schemas
1. **Question-answer structure:** format H2 headings as questions
1. **E-E-A-T signals:** author profile, company experience visible
1. **Internal link structure:** link articles to [pillar page](/en/ai-optimization/) and each other

## Summary

Microsoft Copilot chooses its sources from the Bing index. Schema markup, structural content, and E-E-A-T signals determine whether your site appears in Copilot answers.

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