Litera brings document comparison and Firm AI Search to Microsoft Copilot for legal
The practice and business of law, together in Microsoft Copilot for legal
Firms investing in Microsoft Copilot need more than another way to generate content. They need legal-specific capabilities that support reliable client work and make the firm’s knowledge easier to apply.
The stakes show up in everyday work. A contract comes back from the counterparty, and the lawyer needs to know exactly what changed before assessing the risk. A pitch request arrives, and the practice leader needs to identify the firm’s relevant experience and strongest team.
For firm leaders evaluating how to extend their Copilot investment, both scenarios raise the same question: can lawyers access the precision and firm intelligence they need within the environment they’re being asked to adopt?
Litera, the legal AI platform provider that unifies the practice and business of law, now brings document comparison and firm intelligence into Microsoft Copilot for legal. Through plugins for Litera Compare and Firm AI Search, lawyers can compare document versions and find relevant firm experience in plain language within Copilot.
The integration connects the precision lawyers need to advise clients with the institutional knowledge firms need to win and deliver work—bringing the practice and business of law together where lawyers are already working.
What is Microsoft Copilot for legal?
Microsoft Copilot for legal brings purpose-built legal skills and partner-built plugins into Copilot. Building on the capabilities previously introduced as Legal Agent, it supports document work in Microsoft Word and broader, multistep workflows in Copilot Cowork. Microsoft’s legal skills help professionals draft from approved precedents, review agreements against playbooks, extract obligations, and develop legal analysis.
Partner plugins connect Copilot to the specialized systems legal teams rely on. Microsoft’s launch announcement includes providers across legal research, document and matter management, legal AI, agreements, and e-discovery, with Litera among its document, matter, and transaction management partners.
A conversational interface gives lawyers a place to ask for help. The capabilities and information it connects to determine what that help can accomplish.
Litera adds two complementary capabilities: a comparison engine built to identify document changes and a search experience grounded in the firm’s own knowledge.
How Litera Compare works inside Copilot
A lawyer reviewing a revised agreement can ask:
“Compare this draft against the version the counterparty sent back.”
Copilot calls Litera Compare to perform the comparison and returns a link to the full results. The lawyer starts the task through Copilot, while Litera’s proprietary comparison engine generates the redline.
Built on 30 years of document comparison expertise, Litera Compare supports comparison across Word, Excel, PowerPoint, PDF, and other formats, using a deterministic approach to identify differences in document content, including text, tables, and embedded objects.
The redline gives lawyers a concrete starting point for review. They can use Copilot to help summarize the changes, identify potential risks, and develop mitigation strategies. The sequence matters: establish what changed, then analyze what those changes mean.
Why deterministic comparison matters in legal work
Document comparison and legal analysis answer different questions.
- Comparison asks: What changed between these versions?
- Analysis asks: What does that change mean for the client, agreement, or negotiation?
Litera separates those tasks by grounding AI-assisted analysis in the output of its deterministic comparison engine. A general-purpose language model doesn’t generate the underlying redline. Litera’s negotiation platform follows the same approach: verifiable comparison first, AI-assisted interpretation on top.
A summary gives lawyers a way into the review, not a substitute for the comparison itself. They can inspect the redline and decide which changes matter and how to respond.
Deterministic versus probabilistic outputs
The practical distinction comes down to identifying differences through a defined comparison process versus interpreting those differences.
| Task | Role in the workflow |
|---|---|
| Deterministic document comparison | Establishes the changes between document versions through Litera’s proprietary comparison engine. |
| AI-generated summary and analysis | Helps explain the changes, surface potential concerns, and develop possible responses. |
| Lawyer review | Evaluates the evidence, applies legal judgment, and determines the negotiating position. |
The roles complement one another, but they aren’t interchangeable. Litera grounds its AI-assisted negotiation capabilities in the Compare engine so lawyers can move from a verifiable redline into analysis and action.
What Firm AI Search connects inside Copilot
Knowing what changed in a contract is one kind of legal intelligence. Knowing who’s handled a similar matter is another.
Firm AI Search connects information across Litera Foundation, matter systems, and expertise databases through a conversational interface. Foundation brings together matter history, lawyer credentials, and client data, making the firm’s experience searchable and reusable.
Inside Copilot, a lawyer preparing for a pitch can ask:
“Who in our firm has handled cross-border M&A work for pharmaceutical companies in Germany?”
The lawyer doesn’t need to translate the request into separate searches across multiple systems or send a firmwide email. Firm AI Search retrieves relevant information from the firm’s connected data and provides cited answers.
Citations help lawyers examine the records behind a response. They can check a matter’s relevance, understand a colleague’s experience, and determine which credentials belong in the pitch. Firm AI Search makes institutional knowledge available within the lawyer’s working environment.
For practice leaders, the connection is practical: the firm’s past work becomes easier to find and apply to its next opportunity.
How ethical walls and access permissions apply
Making firm knowledge easier to find mustn’t make restricted information easier to access.
Firm AI Search provides cited answers that respect ethical walls and access permissions. The Copilot integration brings permissions-aware search into the conversational workflow without turning firm knowledge into an unrestricted pool of information.
Microsoft also states that Copilot works only with content each user can access and honors sensitivity labels. Its legal capabilities process prompts and responses within the Microsoft 365 service boundary, with enterprise data protection. Prompts, responses, and documents aren’t used to train the underlying foundation models.
The controls serve related but distinct purposes. Microsoft governs access within its environment, while the connected Litera search experience must respect the restrictions attached to firm information. Firms should review both as part of the deployment.
Bringing the practice and business of law into one place
The two plugins support different moments in a lawyer’s day:
- During a negotiation, Litera Compare establishes what changed, so the lawyer can focus on its implications.
- During pitch preparation or team selection, Firm AI Search surfaces the experience and expertise relevant to the opportunity.
- Across both workflows, Copilot provides a conversational starting point for accessing specialized Litera capabilities.
The value goes beyond having fewer applications on a screen. Lawyers get a shorter path between a question and the information they need to act.
A lawyer can move from reviewing an agreement to finding colleagues with relevant experience in the same Copilot environment. The underlying tools remain specialized, but each task doesn’t need to begin with a different interface.
Embedded legal AI should make the right capabilities easier to access without asking lawyers to reorganize their day around the technology.
What Microsoft 365 E7 means for Litera customers
Alongside the integration, Litera has adopted Microsoft 365 E7, the Frontier Suite.
E7 brings together Microsoft 365 E5, Microsoft 365 Copilot, Microsoft Entra Suite, and Microsoft Agent 365. The suite combines enterprise productivity and AI with security, identity, and agent-governance capabilities.
Litera’s adoption supports its work to accelerate how new capabilities reach law firms and in-house teams. It also reflects Litera’s continued investment in the Microsoft environment where customers already work.
Litera’s adoption of E7 is separate from customer eligibility for the plugins. Firms should confirm the applicable Microsoft and Litera requirements. Without confirmation, an E7 subscription shouldn’t be treated as a prerequisite for, or an automatic entitlement to, the Litera plugins.
Which firms can use the Litera plugins?
The integration is for law firms and corporate legal departments using Microsoft Copilot that want to extend it with legal-specific capabilities.
Microsoft says its new legal capabilities are generally available to Copilot customers worldwide, while partner plugins are rolling out through the Microsoft plugin registry over time. Platform availability doesn’t establish eligibility for every partner capability.
Firms should confirm availability, licensing, and deployment requirements for each Litera plugin, including the Foundation environment and connected data required for Firm AI Search. Litera’s earlier Firm AI Search announcement specified availability for Foundation Cloud customers, with an initial rollout to U.S.-based firms.
Your firm’s next advantage is putting its knowledge to work
Extending Copilot for legal means connecting the interface lawyers use with the capabilities their work demands.
Litera Compare brings a deterministic foundation to document review. Firm AI Search brings the firm’s experience and expertise into reach. Together, they support Litera’s Return on AI (RoAI) framework: greater efficiency, stronger client relationships, and business growth.
Lawyers can spend less time assembling information and more time applying it—to strengthen client advice, demonstrate relevant expertise, and pursue new work.
Learn more about Litera’s Microsoft Copilot integration.
