Klammer
Klammer is a macOS utility for opening and viewing Microsoft Outlook file formats that do not natively open on a Mac: MSG (Outlook message files), Winmail.dat (TNEF-encoded attachments and messages), and OFT (Outlook email templates). It displays the full contents and attachments of these files, supports exporting to standard Mac formats (EML for email, ICS for calendar events, VCF for contacts), and integrates with Quick Look, Spotlight search, and the system Address Book. The app is typically used by Mac users who need to read email archives or templates sent from Windows Outlook users, and includes an optional bulk-conversion feature for processing large collections of files at once.
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1 suggestionNo evidence of a native Apple Silicon build for Klammer exists in the available search results. The latest documented version appears to be 3.1, last mentioned around 2024–2025. There are no public announcements, release notes, or GitHub repositories indicating that Kupon (the developer) has shipped or plans to ship a native build. If you rely on Klammer, contact the developer directly at [email protected] to confirm their roadmap before September 2028, when Rosetta 2 is removed and Intel-only apps will no longer launch on macOS 28. In the meantime, Klammer continues to work under Rosetta 2. As a contingency, consider whether you can export your MSG files to EML or ICS format and open them with native macOS Mail or Calendar, or explore dedicated open-source tools like libpst (which powers several cross-platform email viewers) if Klammer becomes unavailable.
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