Open Winmail.dat, MSG and OFT files on your Mac and view their contents and attachments.

"Klammer is very good at what it does..." - Jeffery Battersby, MACWORLD

"Bulk Convert" add-on now FREE!


- View MSG files
- View Winmail.dat files
- View OFT files
- Access attachments, body and message details of the emails
- Supports displaying rich-formatted message body - inline images, links, formatted text, tables and everything
- Export emails to EML files, natively supported by Mac OS
- Open emails in other application - Mail, Outlook, Thunderbird and others
- Supports viewing MSG, OFT and Winmail.dat files that contain contacts, appointments, calendar events and tasks
- Import contacts to Address Book
- Save contacts to vCard
- Import appointments and calendar events to iCal
- Export appointments, calendar events and tasks to vCalendar (.ics) files
- Quick Look attachments in MSG, OFT or Winmail.dat files
- Spotlight integration allows you to search all text information in MSG, OFT and Winmail.dat files - subjects, text content, contacts and even attachments names
- Seamless integration with the OS - Quick Look and Preview of MSG, OFT and Winmail.dat files
- Easy access recently opened files
- Integrated with your Address Book

Bulk convert MSG, OFT and Winmail.dat files (Upgrade via FREE In-App Purchase)

Bulk Convert is a feature of Klammer that allows you to convert multiple MSG, OFT and Winmail.dat files to the format corresponding to their contents - .EML for emails, .ICS (iCal) for tasks and appointments and .VCF (vCard) for contacts. It is as simple as selecting source and destination folder and all your archive of Outlook exports will be transformed to Mac OS friendly formats. Seamless integration with Mountain Lion 10.8 Notification Center - never miss when your files are converted.

Availability Notice!
The Bulk Convert feature is available only on Macs running Mac OS 10.7 Lion or later after an additional FREE upgrade!

What are MSG files?
MSG (outlook mail message files) are messages created or saved within Microsoft Outlook. They can contain emails, contacts, tasks, task requests, appointments and etc.

What are Winmail.dat files?
Outlook and other applications often encode the messages and their attachments in a Winmail.dat file. This application will
allow you to view that file and access the attachments and the encapsulated information for the email.

What are OFT files?
E-mail templates used by Microsoft Outlook. Contains a pre-formatted layout that can be used for creating custom messages with a similar look and feel

Please, use to contact us. We cannot reply to user reviews! Thank you.

What’s New

Version 3.1

Improved support for Korean charsets
Minor bugfixes

Ratings and Reviews

3.1 out of 5
31 Ratings

31 Ratings

vcantante ,

Converted most of the oft, but left gibberish

The tool converted the bulk of an oft message, but the bottom portion was gibberish. I suspect this is because the body of the oft file contained numerous links to other sites. Will still need to go back to the oft creator and ask her to save a .docx version for me to use.

Will use it for less complex oft conversions.

bobchi ,

Great if changed to mac from PC and have lots of msg files

I switched from a PC to a mac, but still use Outlook. I had thousands of emails saved in hundreds of folders. Klammer lets me read and forward them. I bought bulk convert. Once purchased it's good for life. It converted the thousands of files into the same folders, by choosing the destination file as the same as the source file. Worked great. Not sure I needed to do the bulk convert, since I could read any msg file anyway. Customer support returned my email question in less than 24 hours and did a follow up email. Works fast. Installs fast. I don't give hardly any apps 5 stars, this is a very high rating by my standards.

KKmii ,

Perfect for reading Windows Outlook emails on my Mac

This is perfect for my purposes - I use a Windows computer at work but synchronize all the files onto my Mac for working at home. I bought Outlook for Mac and I can import email folders into the Mac that way, but for the individual email files saved in various non-email folders, Klammer allows me to read them and makes it easy to go back and forth between the two computers. For $5, this was well worth it!


Kupon.BG ltd
1.2 MB

OS X 10.6.6 or later



Age Rating
In-App Purchases
  1. Bulk Convert


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer