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Microsoft 365 Co-Authoring vs. DMS Check-In Control

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Two Lawyers, One Document, Two Systems: Where Co-Authoring Meets DMS Control

Co-Authoring & DMS Control

Two Lawyers, One Document, Two Systems:Where Co-Authoring Meets DMS Control

Thought Leadership | netDocShare | Microsoft 365 Co-Authoring vs. DMS Check-In/Check-Out Control

Two lawyers open the same asset purchase agreement in Word for the web through SharePoint. They edit together in real time, see each other’s changes, and move the agreement forward without waiting.

The problem begins when that same document is governed by a legal document management system (DMS).

A DMS such as NetDocuments or iManage uses check-in and check-out to control matter documents. Check-out establishes who is working on a document; check-in records the updated version and maintains the document’s official history.

So when lawyers co-author that document in Microsoft 365, the firm needs both systems to stay aligned.

Why Does This Happen?

Microsoft 365 and a DMS are designed around different models.

  • Collaboration layer

    Microsoft 365 / SharePoint:

    Built for real-time collaboration. Multiple lawyers can open and edit the same document simultaneously.

  • System of record

    DMS:

    Built for document control. Check-in/check-out, version history, permissions, and an authoritative matter record help the firm know which version is official and who has control.

Microsoft’s own guidance highlights the tension: required check-out in a SharePoint library is not compatible with real-time co-authoring.

So the challenge is not co-authoring itself. It is keeping DMS document control synchronized with the Microsoft 365 collaboration experience.

What Happens When They Are Not Aligned?

Document management is already a major challenge for legal teams. The 2026 Nextpoint eDiscovery Landscape Survey found that 58% of legal professionals identified document management, review, and reduction as one of their firm’s biggest challenges, the highest-cited challenge in the study.

Consider the same agreement.

A lawyer checks it out through the DMS. The document is then opened in Microsoft 365, where two lawyers collaborate on it.

If the document-control status does not carry consistently between the two environments, they can end up with different views of the same document:

  • Microsoft 365 is managing an active collaborative editing session.

  • The DMS maintains its own check-in/check-out and version status.

  • The firm still needs one clear, authoritative matter to record.

That can lead to version conflicts, duplicate records, or manual reconciliation when the work needs to be reflected in the DMS.

The Solution: Propagate Document Control

The answer is not necessarily to turn off co-authoring.

Instead, the document’s DMS status needs to remain consistent throughout the collaboration process:

  • Check-out:

    The DMS establishes who has control of the document.

  • Co-authoring:

    Lawyers work together in Microsoft 365 while that document-control status remains visible and aligned.

  • Check-in:

    Once the work is complete, the updated version is checked back into the DMS.

  • Record:

    The DMS retains the authoritative version and its document history.

The handoff

Document control that stays consistent end to end

The four states named in this article, in the order a matter document moves through them.

This allows firms to preserve the collaboration lawyers expect from Microsoft 365 without weakening the document controls they rely on in their DMS.

The Question to Ask Before the Next Microsoft 365 Rollout

The question is not whether lawyers should co-author Microsoft 365. It is:

When a document is checked in or checked out of the DMS, does that status propagate correctly into the Microsoft 365 collaboration experience?

If lawyers still have to download files, re-upload versions, compare documents, or manually resolve conflicts, there is a gap in the workflow.

The goal is simple: real-time collaboration for lawyers, with DMS-level control, and one authoritative matter record.

Real-time Collaboration
For Lawyers
DMS-level Document
Control
One record Authoritative
Matter Record

Frequently Asked Questions

The answer is not necessarily to turn off co-authoring. Instead, the document’s DMS status needs to remain consistent throughout the collaboration process: check-out establishes who has control, lawyers work together in Microsoft 365 while that document-control status remains visible and aligned, the updated version is checked back in, and the DMS retains the authoritative version and its document history.

Microsoft’s own guidance highlights the tension: required check-out in a SharePoint library is not compatible with real-time co-authoring. So the challenge is not co-authoring itself. It is keeping DMS document control synchronized with the Microsoft 365 collaboration experience.

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by KLoBot Inc

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