Microsoft launched Copilot for Legal on 15 October 2026, and it’s already available to Copilot customers worldwide. For UK law firms that run on Microsoft 365, that matters. AI contract review and drafting now sit inside Word, the tool your fee-earners open first thing every morning.
It’s tempting to buy the licences and switch it on. We’d urge a little patience. Copilot is only as useful, and only as safe, as the data it can reach. If your permissions are messy, it will find the mess.
At Quiss Technology, we’ve spent the past few months talking to managing partners and IT leads about exactly this. Here’s what Copilot for Legal actually does, and the three things we think every firm should sort out before rollout.
What is Microsoft Copilot for Legal?
Copilot for Legal is a set of more than 20 legal-specific skills inside Microsoft Copilot. It works in Word and in Cowork, Microsoft’s workspace for multi-step tasks. It builds on Legal Agent, the contract review tool Microsoft trialled with early-access customers from April. It also brings in plugins from legal tech partners including iManage, NetDocuments, Litera, Harvey and Docusign.
In practice, that means:
- Contract review against your playbook. Copilot checks an agreement against your firm’s standard positions and proposes changes as proper tracked changes in Word, with the formatting left intact.
- Drafting from your own precedents. It can work from approved templates and precedents stored in SharePoint, so nobody starts from a blank page.
- Work across many documents. Comparing key terms across a portfolio of agreements, tracking obligations and deadlines, or building a chronology for a dispute.
- Meetings into records. Pulling out key dates and open questions, and drafting minutes and resolutions from meeting notes.
UK firms are already on board. Microsoft named Clyde & Co as a launch customer, and the firm’s CIO says Copilot adoption across its lawyers is approaching 90%.
Three things to get right before you roll it out
1. Fix your permissions first
Copilot respects your Microsoft 365 permissions. That’s reassuring. It’s also the problem.
In most firms, SharePoint and OneDrive permissions drift over the years. A folder gets shared with “everyone” to hit a deadline. A former partner’s access never gets tidied up. HR files, partner remuneration spreadsheets and sensitive matter documents end up visible to far more people than intended. Nobody notices, because nobody goes looking.
Copilot goes looking. Ask it the right question and it will happily summarise a document the user could technically open but was never meant to see. For a law firm, with duties of confidentiality to clients and obligations under UK GDPR, that isn’t a theoretical risk.
Before you assign a single licence, carry out a proper data discovery and permissions review. Microsoft Purview sensitivity labels and SharePoint Advanced Management will help, but the real work is deciding who should see what, matter by matter.
2. It’s a drafting assistant, not a research database
Copilot for Legal is very good at drafting, summarising and redlining. It isn’t a replacement for Westlaw, Lexis+ or Practical Law, and it certainly isn’t a replacement for a solicitor’s judgement.
It’s worth noting that neither Westlaw nor LexisNexis was among Microsoft’s launch partners. If your fee-earners rely on them for research, that workflow isn’t changing any time soon. Set expectations early, so nobody mistakes a confident-sounding summary for settled law.
3. Keep a human in the loop, every time
Microsoft’s own numbers look encouraging. During the Legal Agent trial, more than 1,800 users generated nearly 100,000 suggested edits and kept roughly seven in ten of them. Microsoft’s internal testing also rated the edits above 90% for fluency.
Now read that the other way round. Around three in ten suggestions were rejected, and the scores come from Microsoft’s own evaluations rather than an independent legal benchmark.
So the golden rule hasn’t changed. Copilot produces drafts; solicitors produce legal documents. Every output needs review by a qualified person before it goes anywhere near a client, because responsibility for the advice stays with the solicitor, whatever tool helped draft it.
From licence to lasting value
Getting Copilot for Legal into your firm is the easy part. Getting real value from it, safely, takes groundwork: tidy permissions, clear usage policies, practical training, and a document management set-up that supports Copilot rather than fights it.
That’s where we come in. Quiss Technology helps UK law firms audit their SharePoint environments, tighten Microsoft 365 permissions and plan Copilot rollouts that partners and clients can trust.
Thinking about Copilot for Legal? Book a data-readiness review with our team, and we’ll show you where your risks are before Copilot does. – contact one of the team at https://www.quiss.co.uk/digital-academy/
Frequently asked questions
Is Copilot for Legal available in the UK? Yes. Microsoft says the legal capabilities are generally available to Microsoft Copilot customers worldwide.
Will Copilot show staff documents they shouldn’t see? Copilot can only surface content a user already has permission to open. If those permissions are too broad, though, Copilot makes the problem visible very quickly. That’s why a permissions review should come first.
Does Copilot for Legal replace Westlaw or LexisNexis? No. It’s a drafting, review and summarising tool. Neither Westlaw nor LexisNexis was a launch partner, so keep your existing research tools.
Can we pilot Copilot for Legal with a small group first? Yes, and we’d recommend it. Start with one practice group whose matters are well organised, review the results, then widen access once permissions and policies are in place.
Author David Ricketts – https://www.linkedin.com/in/david-ricketts-7437991/
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