Thomson Reuters CoCounsel Legal vs Microsoft 365 Copilot Business
Side-by-side from the Top 11 rankings of MyCase vs Clio vs CoCounsel: 11 Best AI for Law Firms 2026 and ChatGPT vs Microsoft Copilot vs Zapier Agents: 11 Best AI Agents for Small Business 2026. Last verified October 1, 2026.
The short answer
Thomson Reuters CoCounsel Legal ranks higher on Top 11 (#3 vs #4) for Managing partners, firm administrators and operations leads at United States law firms of roughly 2 to 50 lawyers, on Clio, MyCase, Smokeball or Microsoft 365, who are deciding which AI to buy first and want it to work inside the systems they already pay for. / Owners, founders and operations leads at United States companies under 500 people who have decided to buy an AI agent, have no engineer on staff, and want to know which one to pay for, what it costs at five or fifty people, and which of them is wrong for their business.. The longest list of named law firm systems on this page, and research cited to Westlaw.
At a glance
| Thomson Reuters CoCounsel Legal | Microsoft 365 Copilot Business | |
|---|---|---|
| Top 11 rank | #3 / MyCase vs Clio vs CoCounsel: 11 Best AI for Law Firms 2026 | #4 / ChatGPT vs Microsoft Copilot vs Zapier Agents: 11 Best AI Agents for Small Business 2026 |
| Score (out of 9.4) | 8.6 | 7.6 |
| Best for | Westlaw firms on iManage or NetDocuments that draft in Word | Companies already on Microsoft 365 whose work lives in Outlook, Excel and Teams |
| Pricing | $$$ (no price published; quote after a short form; one, two or three year terms with the longer terms discounted; more than 10 attorneys goes to a sales rep) | $$ (Microsoft 365 Copilot Business $18.00 per user per month paid yearly, promotional against a standard $21.00, or $25.20 month to month; the full Microsoft 365 Copilot is $30.00 per user per month paid yearly; Copilot Studio credit packs $200.00 for 25,000 credits a month) |
| HQ | — | Redmond, Washington |
| Founded | — | — |
Thomson Reuters CoCounsel Legal
The longest list of named law firm systems on this page, and research cited to Westlaw.
legal.thomsonreuters.com/en/products/cocounsel-legalSee full entry in MyCase vs Clio vs CoCounsel: 11 Best AI for Law Firms 2026
Microsoft 365 Copilot Business
Cheapest agent to deploy if you already run Microsoft, because deployment is a licence change.
www.microsoft.com/en-us/microsoft-365-copilot/businessMethodology and scoring weights live at /methodology. No vendor pays for placement — see about.