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Microsoft Resolves Outlook Bug Affecting Encrypted Emails

Microsoft Resolves Outlook Bug Affecting Encrypted Emails

First seen 30 Jan 2026, 19:15 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft has addressed a bug that prevented Microsoft 365 customers from accessing encrypted emails in classic Outlook after a December update. Users attempting to open messages encrypted with 'Encrypt Only' permissions encountered issues, seeing a message_v2.rpmsg attachment instead of the email content. The problem was linked to the Current Channel Version 2511 (Build 19426.20218).

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