Microsoft Outlook Classic Bug Prevents Opening Encrypted Emails
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A bug in Microsoft Outlook Classic prevents users from opening encrypted emails with 'Encrypt Only' permissions after a recent update. The issue affects recipients who try to open these emails, displaying an error message and an inaccessible attachment instead of readable content. Microsoft is investigating the problem and has provided temporary workarounds while a permanent fix is in development.
Timeline
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07.01.2026 18:30 1 articles · 23h ago
Microsoft Investigates Outlook Classic Bug Preventing Opening Encrypted Emails
Microsoft is investigating a bug in classic Outlook that prevents users from opening encrypted emails with 'Encrypt Only' permissions. The issue affects recipients who try to open these emails, displaying an error message and an inaccessible attachment instead of readable content. Microsoft has provided temporary workarounds while a permanent fix is in development.
Show sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
Information Snippets
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The bug affects recipients trying to open 'Encrypt Only' encrypted emails in classic Outlook.
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
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The issue occurs after updating to Current Channel Version 2511 (Build 19426.20218).
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
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Users see a message 'This message with restricted permission cannot be viewed in the reading pane until you verify your credentials.'
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
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Instead of readable content, users see a message_v2.rpmsg attachment.
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
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Microsoft has provided two temporary workarounds: saving encrypted emails before sending or reverting to a previous software build.
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30
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Microsoft is working on a fix but has not provided an estimated timeline for resolution.
First reported: 07.01.2026 18:301 source, 1 articleShow sources
- Microsoft: Classic Outlook bug prevents opening encrypted emails — www.bleepingcomputer.com — 07.01.2026 18:30