Letter Opener
Universal version latest seen at v15.0.2 · Reported by 1 Mac in the community.
Sighting data is community-sourced — version availability and pricing should be verified with the developer.
Letter Opener is a Mail plugin for macOS that allows users to open, read and extract attachments from Microsoft Outlook email files including winmail.dat, MSG and XPS formats. These proprietary email formats are often unreadable by Apple Mail by default, making Letter Opener essential for Mac users who receive emails from Windows Outlook users. The plugin integrates directly with Mail, enabling users to preview these files via Quick Look and convert their contents to standard macOS formats. A native Apple Silicon build has been confirmed running on Macs in the Rosetta Check community.
AI Recommendation
1 suggestionA native Apple Silicon build of Letter Opener is available from the vendor. Download the latest version from the Letter Opener download page at winmail.help — the installer will serve the Universal Binary. After running the Letter Opener.pkg installer, follow the activation steps in the Mail Integration section to complete the plugin setup. The native build will replace your existing Intel-only plugin, giving you better performance and battery life without any data loss. Your Mail integration settings and preferences will carry over automatically.
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