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MC1253750 — Microsoft 365 Copilot: Upload local files now supports .eml and .msg file types

MC1253750Microsoft 365 Copilot ChatstayInformedUpdated: 16 March 2026

Microsoft 365 Copilot will support uploading .eml and .msg email files starting late February to March 2026, enabling users to provide email context for prompts. This feature is automatic, requires no admin setup, affects all Copilot users, and has no new compliance concerns.

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Applies to: Microsoft 365 Copilot Chat
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).