Receiving a mysterious winmail.dat attachment instead of a readable email is a common frustration for Apple users communicating with Microsoft Outlook or Exchange senders. Winmail Reader solves this instantly — decoding TNEF files natively on macOS, iPhone, and iPad, restoring the original rich-text message, and extracting all embedded attachments, calendar events, and contacts in one tap. Everything runs entirely on-device with no internet connection required.
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Key Features
Instant Winmail.dat Decoding
Opens and decodes winmail.dat, winmail, and ATT00001.dat TNEF-encoded files — listing all embedded attachments including email message body, documents, images, and calendar items.
High-Fidelity Message Viewer
Renders the sender's original email message with full support for HTML, RTF, and plain text — including nested messages read in full RTF format as separate files.
One-Click Attachment Extraction
Save individual or all extracted attachments to any destination in one click. Drag and drop directly from the file list to Finder, or copy-paste attachments to any location.
Resend Decoded Email
Resend the entire decoded email as-is — with the reconstructed message body and all extracted attachments — directly from macOS or iOS without any manual reassembly.
Calendar & Contact Integration
Automatically creates and adds Microsoft Outlook appointments, meeting requests, and reminders to Apple Calendar. Adds contact address cards directly to macOS or iOS Contacts.
Batch Winmail Extractor
On macOS, use the built-in Winmail Extractor to batch-process multiple winmail.dat files simultaneously — extracting all attachments to your Downloads folder in one pass.
Advanced TNEF Decoding
Supports nested TNEF attachments, embedded OLE object extraction, Sticky Notes, Recall, Activity, Post, and multiple Contacts list message class attributes — the most complete TNEF decoder on Mac.
Standalone & Fully Private
No Microsoft Outlook, Exchange Server access, or internet connection required. All decoding and extraction runs entirely on-device — your private communications never leave your Mac or iPhone.
System Requirements
macOS
- Version
- macOS 11.5 or later
iOS
- Version
- iOS 15.6 or later
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