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mediumExchangeMailbox requirement setnew featurelink_discovery · Jul 16, 2026

[Docs] OnMessageDecrypt

The OnMessageDecrypt feature is now available in the Mailbox requirement set 1.16 for Outlook add-ins, enabling developers to handle decrypted message content. This enhancement supports secure email processing capabilities for Outlook extensions.

Linked from "Mailbox requirement set 1.16 now available for Outlook add-ins": OnMessageDecrypt
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Security
endpoint_security
Audience
developer
Environment
cloudhybrid
Classification confidence: 85%
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[Docs] OnMessageDecrypt | 365Forge