*For this entry exists the more relevant or more recent entry MC1085582
check before: 2025-08-01
Product:
Exchange, Purview Communication Compliance, Purview Data Loss Prevention
Platform:
US Instances, Web, World tenant
Status:
In development
Change type:
Links:
Details:
Traditionally, Exchange has relied solely on the file extension (e.g., .docx, .pdf) to identify the type of an attachment. However, this approach can be bypassed if a file is renamed with a misleading extension. To address this, we’re enhancing our detection logic to go beyond just the visible file extension. With this update, even if a file’s extension is altered, Exchange will evaluate the actual content of the file to determine its true type. This ensures that policies based on file type—such as “File extension is…”—remain effective and secure, even in cases of renamed or disguised attachments. This improvement provides customers with a more robust and reliable way to enforce compliance and security rules around file sharing.
Change Category:
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Scope:
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Release Phase:
General Availability, Preview
Created:
2025-05-10
updated:
2025-05-10
Public Preview Start Date
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Docu to Check
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MS workload name
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summary for non-techies**
Microsoft is enhancing Exchange to analyze file content rather than just relying on file extensions, improving security by accurately identifying file types even if extensions are altered.
Direct effects for Operations**
Please, look at the most relevant linked item for details
explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 3 weeks ago
