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You are wondering if DLP supports co-authoring with MIP?

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Article ID: 254632

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Updated On:

Products

Data Loss Prevention

Issue/Introduction

Microsoft has a feature for Office documents, called “co-authoring” (not enabled by default).

When it is enabled, and a document is open for co-authoring, you are wondering if DLP can still detect labelled content?

 

Environment

Data Loss Prevention where MIP inspection is enabled

Cause

Enabling co-authoring changes how labels are stored for Microsoft Office documents.

This is documented in their article on the topic, Enable co-authoring for encrypted documents - Microsoft Purview (compliance) | Microsoft Learn:

Important

After you enable the setting for co-authoring, labeling information for unencrypted files is no longer saved in custom properties.

Do not enable this setting if you use any apps, services, scripts, or tools that reads or writes labeling metadata to the old location.

Resolution

If co-authoring is enabled, DLP is not able to read MIP labels, however, decryption of MIP documents for content inspection still occurs.

DLP is actively working to support the Microsoft co-authoring feature, in a coming release.