There are many significant takeaways from Microsoft’s Legal Agent launch yesterday (30 April) but the one that resonates most across private practice and corporate legal teams is that Microsoft is bringing a legal agent to the legal masses through the most commonly used tool in the profession – Word.
Legal Agent is designed for workflows such as document review and redlining. Alex Herrity, director of legal operations at Adidas and a regular industry speaker, told Legal IT Insider: “Word is where legal work happens. It always has been. And for the first time in my career, Microsoft has actually built something that suggests they know that – not a general Copilot that lawyers can try to bend toward legal tasks, but a product with legal workflows, playbook review, and redlining logic built in from the ground up by people who came out of legal tech.” By people who came out of legal tech, Herrity refers to the Robin AI team that Microsoft hired last year.
The Legal Agent release follows the recent launch of Claude (by Anthropic) for Word. While Claude’s tool can assist with various (not just legal) documents, Anthropic is specifically targeting legal workflows such as contract review, NDA analysis, and clause redlining. Business Insider described it as “another challenge to Microsoft’s software empire.”
This explains in part why one head of innovation at a major UK law firm tells us: “They [Microsoft] were on the ropes taking punches with zero reaction, so at least this is a response.”
In terms of whether the Legal Agent is good, Herrity says that’s missing the point. “From what I’ve seen of it,” he says, “the functionality isn’t blowing anyone away who’s already across the specialist tools. But that’s almost not the point yet. What matters is the signal: Microsoft being upstream of every other vendor, already approved and trusted by IT and procurement, and sitting inside the tool lawyers open every morning. They’ve got a clear run at the majority of the market that still hasn’t committed to anything. That’s most firms and most in-house teams, still.”
For one legal tech vendor in the drafting space, what is exciting about this launch is that Microsoft is trying to derisk the probabilism in the LLM with deterministic rules. Announcing the Legal Agent, Sumit Chauhan, president of the Office Product Group at Microsoft said: “The agent applies edits in the document through a purpose-built insertion algorithm to drive consistency regardless of how each edit was introduced. The agent’s redlining engine understands the structure of a Word document, not just visible text. It understands and structures Microsoft 365 document format into a representation that preserves formatting, lists, tables, and tracked changes. From there, the agent applies a deterministic resolution layer over the edits, including author-specific changes, instead of relying on an LLM to generate every revision directly. This provides a more reliable foundation for handling complex contracts while helping reduce latency and cost.”
Microsoft owns every bit of Word code and is flexing its muscles. Claude for Word has reportedly been breaking Word’s notoriously difficult document structure. The legal tech vendor, who is not in the compare space, told us: “Microsoft owns everything in Word and you could call this a silent dig at Claude.”
For specialist legal tech vendors, you would expect the Legal Agent to be bad news, and in the comparison space, it is difficult to see how it is positive news, but Herrity says the picture is mixed. “Yes, the pressure is real – but I suspect many of them will see an uptick in demo requests off the back of this,” he says. “Seeing what an agent can do inside Word is going to flesh out the concept for a lot of lawyers who hadn’t really appreciated what was possible until now.”
He adds: “Microsoft will have done some of the education heavy lifting. The real question plays out over time: as the product improves – and it will, they have the money and the Robin AI team know what they’re doing – does Microsoft eat the specialist vendors’ lunch, or is there enough of a marketplace for everyone to find their level? My instinct is it’s too early to call, but the next 18 months will tell us a lot and will raise the floor hopefully in terms of lawyer literacy and tech capability.”
The challenge for technologists is always to choose the best long term product on the right commercial pricing in a way where fee earners are not swamped with options. Derek Southall, founder and CEO of Hyperscale Group and a founding member of LITIG, says: “Many firms want both Microsoft AI (for reasons we will all understand) and a Platform AI tool in terms of wider capabilities and so should we perhaps just view this as a further build of the Microsoft aspect as both capabilities become stronger. ‘Stay tuned” is perhaps the new strap line of Legal IT’.
As we move to a world of agentic AI, the lines will become further blurred. Adam Curphey, director of innovation at Macfarlanes, observes: “In the past people have picked one solution, but I just think we’re going to see more and more that it’s not a case of I’ve just got Harvey or I’ve just got Legora. You’re going to have to use a package of these things because they will be in every tool that you use.”
Amid the blurred lines one thing is certain: Microsoft has shown up to its own fight.
