Your matters live in Outlook folders. That is the whole problem.

Ask a fee earner where a matter lives and you will get a confident answer. A folder in Outlook. A subfolder on the shared drive, named something like Smith v Harlow - NEW. A spreadsheet of key dates that one person maintains. A pile of hard copy for the parts nobody trusts to a screen.

Every one of those answers is correct. That is the problem. The matter is real, but it is not in one place, and no two people hold the same picture of it.

The filing system is a person

In most firms we walk into, the organising principle is not a system. It is whoever has run that matter longest.

That works — genuinely works — right up until one of five things happens: they are on holiday, they leave, they are ill, the matter is reallocated, or somebody has to answer a question about the file under time pressure. Then the firm discovers how much of its working knowledge was never written down anywhere a second person could find it.

None of this is a criticism of how legal work gets done. Email is the medium of a matter; most of what happens on a file arrives and leaves as correspondence. The trouble is that a mail client organises by conversation and date, and a matter is organised by none of those things.

What a matter actually is

Write down what has to be true about a file before you would be comfortable handing it to a colleague at an hour's notice, and the list is always roughly the same:

• The parties. Who is who, on both sides, including the ones who only appear in one email from eight months ago.
• The correspondence. All of it, in order, including the thread somebody answered from their phone and never filed.
• The documents. With a current version that is unambiguously current.
• The dates. Limitation, directions, hearings, renewals — and who is watching each one.
• The money. Time recorded, disbursements, what has been billed, what has not.
• The history. What was advised, when, and on what basis.

Six things. In a folder-based firm they live in six different places, maintained by different people to different standards, and reconciled only when somebody asks.

Four things that break, in order of how expensive they are

Conflicts

A conflict check is only as good as the record it searches. If parties are recorded in matter names, email subject lines and one person's head, the check is a best effort rather than a search. Firms know this, which is why the check is so often done by asking the room.

Handover

The cost of a handover is not the time spent reading in. It is the time spent working out what you have not yet found. A fee earner inheriting a file from a folder structure cannot tell the difference between "there is nothing else" and "there is something else, elsewhere".

Deadlines

Key dates held in a personal spreadsheet or an Outlook reminder are visible to one person. The firm has no view of what is due across all live matters next week, which means risk is managed matter by matter rather than across the practice.

Audit and oversight

Supervision, file reviews and any kind of regulatory or insurer enquiry all ask the same question: show me the file. A file assembled on demand from four systems is an afternoon's work and an anxious one.

Why Microsoft 365 is already the right place

The usual answer is a dedicated practice management system, and for many firms that is the right answer. But there is an argument for building the matter where the work already happens, and it is a strong one: the correspondence is in Exchange, the documents are in SharePoint and OneDrive, the conversations are in Teams, the identities are in Entra, and the retention and eDiscovery tooling is in Purview.

A matter-centric layer on top of that is not a new silo. It is a structure placed over content the firm already holds — which means no migration of mail into a separate database, no second place to look, and no licence for a system that duplicates what you are already paying for.

That is what LegalCase 365 is: case, hearing and document management built inside Microsoft 365 rather than beside it.

What changes when the matter is the unit

• One record per matter, with parties, correspondence, documents, dates and time against it rather than scattered around it.
• Filing that is a click, not a discipline. Mail filed to the matter from Outlook, where the fee earner already is. Anything that requires leaving the tool will not happen consistently, and a filing system that works only when people are not busy is not a filing system.
• Dates the firm can see. Hearings and deadlines on a view somebody other than the file handler reads.
• Permissions that match the engagement. Access granted because somebody is on the matter, removed when they are not — rather than inherited from a folder nobody has reviewed since 2019.
• A file that assembles itself when it is asked for.

And then there is Copilot

This is the part that has changed the arithmetic in the last two years, and it is worth being precise about why.

Microsoft 365 Copilot answers from the content in your tenant that the person asking can already open. Its answers are therefore only as good as the structure underneath them. Ask it to summarise the position on a matter, and if "the matter" is a folder name that appears nowhere in the content, it has nothing to anchor on. Ask the same question where correspondence, documents and key dates are all related to one matter record, and the question becomes answerable.

So the unglamorous work — filing, structure, permissions — is not a prerequisite the AI lets you skip. It is the thing that decides whether the AI is useful on your files or merely impressive on somebody else's demo.

It is also the thing that decides whether it is safe, which is a separate question and a sharper one in legal work. We wrote that up here: Copilot will not leak your client files — your permissions will.

Where to start, if the folders are already there

Nobody rebuilds twenty years of filing. What works is drawing the line at today:

1. New matters open in the new structure. From a date, with no exceptions, because exceptions are how the old system survives.
2. Live matters migrate at a natural break — a new phase, a reallocation, a hearing.
3. Closed matters stay where they are and are dealt with by retention policy rather than by hand.
4. Review the permissions on the old drive regardless. Whatever else happens, that is the thing most likely to cause a problem, and it is the thing Copilot will find first.

The firms that find this easy are the ones that treat it as a records problem rather than a software purchase. The software is the easy half.

LegalCase 365 builds matter, hearing and document management inside your existing Microsoft 365 tenant. If you would rather talk through the records side first, that is a conversation we have often.