Bing Copilot Holds 18% of AI-Assisted Legal Search — and Disproportionate Share Among Enterprise Users
New data from AI search market tracking firms reveals that Bing Copilot — Microsoft's AI assistant integrated into Edge, Windows, and Microsoft 365 — has grown to capture approximately 18% of AI-assisted legal searches in the United States. This positions Bing Copilot as the second-largest AI search platform for legal queries, behind Google AI Overviews and ahead of Perplexity and ChatGPT Search in legal query market share.
The 18% figure understates Bing Copilot's strategic importance because it is skewed toward high-value user segments. Bing Copilot's legal market share among enterprise users — corporate clients, in-house counsel, government agencies, and business professionals — is estimated to be significantly higher than its overall share, reflecting the Windows and Microsoft 365 ecosystem's dominance in enterprise computing environments.
For Law Firms Targeting Business Clients, Bing Copilot Is More Important Than Its Overall Share Suggests
For law firms targeting business clients — business litigation, employment law, corporate transactional work, IP, government contracts — Bing Copilot is arguably more important than its overall market share suggests. The decision-maker at a business considering outside legal counsel is more likely to be using a Windows PC with Edge than an iPhone with Safari. The in-house counsel researching outside counsel options is more likely to be using Microsoft 365 Copilot than ChatGPT.
Despite this strategic importance, Bing Copilot remains one of the most underinvested AI search channels in legal marketing. Most legal marketing agencies have no Bing Copilot optimization services or expertise. This creates a significant opportunity asymmetry: firms that develop Bing Copilot optimization now are entering an uncontested space while competitors focus exclusively on Google and ChatGPT.
Bing Copilot Optimization Requires 3 Actions Google Optimization Doesn't — Including LinkedIn
Bing Copilot optimization differs from Google AI Overview optimization in several important ways. Bing Webmaster Tools verification and sitemap submission are far more important for Bing Copilot than Google Search Console is for Google AI Overviews, because Bing's index is the foundation of Copilot's web retrieval. LinkedIn profile completeness is uniquely important for Bing Copilot because Microsoft's ownership of LinkedIn means LinkedIn data is integrated into Bing's entity graph for professionals. Content freshness signals receive higher weight in Bing's algorithm than in Google's, making quarterly content updates and explicit date markup more impactful for Copilot citation than for Google AI Overview citation.
Microsoft 365 Copilot in Enterprise Legal Research: A Client Acquisition Channel No Competitor Has Claimed
Beyond consumer Bing Copilot, Microsoft 365 Copilot — the enterprise AI integrated into Word, Outlook, Teams, and Excel — represents an emerging research channel for corporate legal decision-making. When a CFO asks Microsoft 365 Copilot to research employment law requirements for a workforce reduction, Bing's web retrieval powers the response. Law firms visible in Bing's index for relevant queries can appear in this enterprise research context — a placement that no other AI marketing channel currently provides. LawCore AI's AI search audit now includes Bing Copilot visibility assessment as a standard component. Contact us for a free audit covering your firm's performance across all five major AI search platforms.