TNEF's Enough for Mac OS

TNEF's Enough

TNEF's Enough allows Macs to read and extract files from Microsoft TNEF stream files. The files are usually received by SMTP based e-mail programs from Microsoft Exchange and Microsoft Outlook users. The SMTP based e-mail program will usually receive either a MIME attachment named "winmail.dat" or a MIME attachment with the type "application/ms-tnef."

The file is a rich text (or MAPI) message that is sent from Outlook to Exchange. When Exchange sends the message to an outside server it writes the MAPI message as a MIME attachment. The unfortunate side effect of this plan is if the Outlook user has someone in their address book as a person who can receive "Rich Text" then the user will receive the TNEF file whether the user uses Outlook or not.

Download - Install - How To Use - Change Log - Feedback


See note at right about downloading/installing via Mac App Store.

Current Version:

Version 3.7 for Mac OS X 10.7 through 10.11

Legacy Versions:

Version 3.2.1 for Mac OS X 10.6/10.7/10.8 (Intel only)

Version 2.2 for Mac OS X 10.5/10.6 (Universal - PowerPC/Intel)

Version 2.0 for Mac OS X 10.4 and earlier (PowerPC only)


See note at right about downloading/installing via Mac App Store.

1. Download

If your browser hasn't opened it, you will have a .DMG file to double click to open. The DMG will open to a disk mounted in the Finder.

2. Copy to Applications directory

Simply drag it to your Applications directory. You might be prompted by your system for an administrator password.

3. Launch as needed or keep in Dock

Most users just open the app as needed. If winmail.dat files are a chronic problem for you, you can keep the app in your doc and drag winmail.dat files to it. See below for more.

How To Use

1. Launch

If you keep TNEF's Enough in the Applications folder, just click to launch. Or store in the Dock if you get frequent winmail.dat files.

2. Open File

TNEF's Enough opens winmail.dat files to show you what's inside them. Assuming you have the winmail.dat file in an email, here are a couple ways to open it:

  • Save the file out of your email program. Choose Open... from TNEF's Enough File menu and locate the file.
  • Save the file out of your email program. Drag the file to the TNEF's Enough icon in the Dock.
  • Simply drag the attachment from your email program to the TNEF's Enough icon in the Dock.

3. Export Files

TNEF's Enough will then show you a window representing the TNEF file. The content is similar to an email message showing the typical From and Subject fields along with sent date, message body and attached files.

There are several ways to get the files out of the winmail.dat file:

  • Select one or more files and select Export... from the File menu.
  • Choose Export All... from the File menu to get all the files.
  • Select one of more files and drag then to Finder.

Read the application help for more information.

If you use Mac OS X Mail, check out this AppleScript to automatically open winmail.dat files sent to you.

Change Log

Here is the most recent version history of the app.

  • version 3.7 (Source)
    • Updated for Mac OS X 10.11 (El Capitan).
    • Backwards compatibility increased to 10.7 (Lion)
  • version 3.6 (see v. 3.7)
    • New icon.
    • Integrated help under "Help" menu.
    • Configured for simultaneous release as download and on Mac App Store.
  • version 3.5 (see v. 3.7)
    • Added support for calendar and contact attachments.
    • Resolved crash. Thank you to Bob K. and Candy G. for sending the problem .dat files.
    • Resigned and compatible with 10.10 Gatekeeper.
  • version 3.2.1 (Source)
    • Code signed and compatible with Gatekeeper.
  • version 3.2 (Source)
    • You can now print the TNEF windows!
  • version 3.1 (Source)
    • TNEF files with an HTML body will now display in a web view.
    • Better support for international characters.
  • version 3.0 (Source)
    • Complete re-write of app.
    • Parsing is based on libytnef.
    • App tested on 10.6.8 and 10.7.1.


Let me know if you have any problems with using TNEF's Enough or if you have suggestions for future versions. My time to answer emails is a bit spotty to say the least but I'll try my best to answer your questions.

Thank You

For everyone who has donated or has passed on their appreciation, I say "Thank You!" Your donations help to keep the lights on (or web site running) so that others with winmail.dat problems on Mac OS X can find a free solution.


If you find TNEF's Enough useful and would like to make a donation, click on the PayPal button to make a donation from your PayPal account or from a credit card.


Or use Square Cash:$JoshJacob

Mac App Store

Prefer to install via the Mac App Store? TNEF's Enough is simultaneously released on this site and the Mac App Store.

Mac App Store

Follow On Twitter

If you would like to stay up to date on software releases, follow my site Twitter feed.