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Transport Neutral Encapsulation Format

May 07, 2024

Transport Neutral Encapsulation Format or TNEF is a proprietary email attachment format used by Microsoft Outlook and Microsoft Exchange Server. An attached file with TNEF encoding is most often named winmail.dat or win.dat, and has a MIME type of Application/MS-TNEF. The official (IANA) media type, however, is application/vnd.ms-tnef.[1]

Overview edit

Some TNEF files contain information used only by Outlook to generate a richly formatted view of the message, such as embedded (OLE) documents or Outlook-specific features such as forms, voting buttons, and meeting requests. Other TNEF files may contain files which have been attached to an e-mail message.

Within the Outlook e-mail client, TNEF encoding cannot be explicitly enabled or disabled (except via a registry setting[2]). Selecting RTF as the format for sending an e-mail implicitly enables TNEF encoding, using it instead of the more common and widely compatible MIME standard. When sending plain text or HTML format messages, some versions of Outlook (apparently including Outlook 2000[3]) prefer MIME, but may still use TNEF under some circumstances (for example, if an Outlook feature requires it).[3][4]

TNEF attachments can contain security-sensitive information such as user login name and file paths,[3][4] from which access controls could possibly be inferred.

Exchange Server edit

Native-mode Microsoft Exchange 2000 organizations will, in some circumstances, send entire messages as TNEF-encoded raw binary independent of what is advertised by the receiving SMTP server. As documented in Microsoft KBA #323483,[5] this technique is not RFC-compliant because these messages have the following characteristics:

  • They may include non-ASCII characters outside the 0–127 US-ASCII range.
  • The lines in these messages are often too long for transport via SMTP.
  • They do not follow the CRLF.CRLF message termination semantics as specified in RFC 821.

Internal communications between Exchange Servers (2000 and later) over SMTP encode the message in S/TNEF (Summary TNEF) format. The conversion between the format needed by the end client on the Internet is performed on the last Hub Transport server before final delivery, and when the Hub Transport role of an Exchange Server is about to deliver the message to a mailbox role server, the message is converted to MAPI format for storage.

S/TNEF differs from TNEF in that it is 8-bit (not 7-bit for TNEF) and does not contain a plain-text portion.

Decoding edit

Programs to decode and extract files from TNEF-encoded attachments are available on many platforms.

Multiplatform edit

  • Geary (email client) supports TNEF since version 3.33.1
  • TNEF Parse – Claws Mail plugin[6]
  • LookOut[7] or its successor LookOut (fix version)[8] – Mozilla Thunderbird extension. See also:
    • LookOut project page at MozDev.org[9]
    • Bug 77811 – Inline viewer for Microsoft proprietary mail formats, a 21-plus-year-old bug report at the Mozilla Bugzilla[10]
  • Wireshark – Version 1.2 and later can open and dissect winmail.dat files, although it is not useful as a mail reader

Unix-like or POSIX command-line edit

  • yTNEF – GPL TNEF extractor from the POSIX command-line, designed specifically for reading winmail.dat[11]
  • TNEF – GPL TNEF extractor from the POSIX command-line[12]
  • KTNEF – GPL TNEF extractor by KDE[13]

Mac edit

  • Klammer – Shareware for Mac OS X, available on App store; also supports MSG files[14]
  • MailRaider Pro - Application for Mac OS X, available on App store; also supports MSG files[15]
  • Winmail Viewer – Shareware Winmail.dat viewer for Mac OS X 10.6 or later, available on App Store, support open Microsoft Outlook (1997, 2000, 2003, 2007, 2010). Winmail.dat files, can extract and save Winmail.dat attachments[16]
  • TNEF's Enough – Freeware decoder for Mac OS 9 and Mac OS X[17]
  • tnefDD – Free GPL decoder with drag-and-drop functionality for Mac OS X[18]
  • TNEF – MacPorts version of the TNEF command-line decoder Mac OS X[19]
  • Letter Opener (previously known as OMiC) – Shareware, plugin for Apple Mail[20]

iPhone and iPad edit

  • Winmail File Viewer – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to save and share extracted files[21]
  • WinMail.dat Viewer - Browse Outlook winmail.dat files – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to view, save and share extracted files[22]
  • Winmail File Viewer+ – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to save and share extracted files[23]
  • Klammer - open EML, MSG and Winmail.dat files – Paid universal app for the iPhone, iPod Touch and iPad with in-app purchase to provide functionality[24]
  • WinDat Opener – Paid app for the iPhone, iPod Touch and iPad[25]
  • Letter Opener – Free Universal app for the iPhone, iPod Touch and iPad with in-app purchase to provide functionality[26]
  • TNEF's Enough - Free Universal app for iPhone, iPod Touch, and iPad[27]

Microsoft Windows edit

  • Winmail.dat Reader – Freeware easy-to-use decoder[28]
  • Winmail Opener – Freeware decoder[29]
  • tnef2win – Freeware decoder[30]
  • Free File Viewer – Freeware decoder[31]
  • fentun – Freeware decoder[32]
  • Winmail.dat Viewer – modern Windows 8 app (non-free)[33]

Android edit

  • TNEF Extractor – A free and open source (GPLv3) Android app[34]
  • Opener – A free Android app[35]
  • Reader - Free Android app also available[28]

Online edit

  • winmail.dat extractor and document converter – Free, in modern, responsive theme[36]
  • Reader Online – The online version of the Winmail.dat Reader (free)[37]
  • tud.at service – Web service and GPL licensed PHP script for reading attachments in winmail.dat files[38]
  • www.winmaildat.com – Another online winmail.dat extractor which allows to upload up to 5 MB[39]
  • the-computer-site.com – converts winmail.dat file to a zip file[40]

Software libraries edit

  • JTNEF – GPL Java TNEF package[41]
  • POI-HMEF – Java library of the Apache POI project[42]
  • MVCOM – Commercial COM component to parse TNEF[43]
  • Convert::TNEF – TNEF library written in Perl[44]
  • tnefparse library – TNEF access library written in Python, licensed under LGPL[45]
  • Aspose Email – Commercial Java and .NET library that can parse and extract TNEF data[46]
  • EAGetMail Component – Commercial .NET and ActiveX library that can parse and extract TNEF data[47]
  • node-tnef - NodeJS command line tool/library that can parse and extract TNEF data[48]
  • libytnef – GPL TNEF extractor library written in C[11]
  • MimeKit – A .NET MIME creation and parser library with support for TNEF[49]
  • TNEF Decoder - A PHP Library to extract TNEF[50]

References edit

  1. ^ "Some Microsoft Media Types for registration". IANA. Retrieved October 25, 2010.
  2. ^ "When you use Outlook 2007 to send an e-mail message, the recipient of the message sees an attachment that is called Winmail.dat". Microsoft. July 29, 2009. Retrieved March 3, 2011.
  3. ^ a b c . Microsoft. Archived from the original on September 4, 2009. Retrieved September 11, 2009.
  4. ^ a b "How e-mail message formats affect Internet e-mails in Outlook". Microsoft. March 30, 2005. Retrieved October 13, 2006.
  5. ^ Microsoft KBA #323483
  6. ^ "Claws Mail - Plugins". www.Claws-Mail.org. Retrieved December 23, 2017.
  7. ^ "LookOut". addons.Mozilla.org. September 30, 2011. Retrieved December 23, 2017.
  8. ^ "LookOut (fix version)". addons.Mozilla.org. Retrieved December 23, 2017.
  9. ^ "mozdev.org - lookout: index". lookout.MozDev.org. Retrieved December 23, 2017.
  10. ^ "77811 - Inline viewer for Microsoft proprietary mail formats (ms-tnef, etc.) ["winmail.dat"]". bugzilla.Mozilla.org. Retrieved December 23, 2017.
  11. ^ a b Yeraze (November 21, 2017). "ytnef: Yeraze's TNEF Stream Reader - for winmail.dat files". Retrieved December 23, 2017 – via GitHub.
  12. ^ Simpson, Mark (December 8, 2017). "tnef". Retrieved December 23, 2017 – via GitHub.
  13. ^ "KTnef". SourceForge. November 15, 2015. Retrieved December 23, 2017.
  14. ^ "Klammer on the Mac App Store". Mac App Store. Retrieved December 23, 2017.
  15. ^ "MailRaider Pro on the Mac App Store". Mac App Store. Retrieved December 23, 2017.
  16. ^ "Winmail Viewer - Open and Read Winmail.dat Files on the Mac App Store". Mac App Store. Retrieved December 23, 2017.
  17. ^ "Josh Jacob - TNEF's Enough". www.JoshJacob.com. Retrieved December 23, 2017.
  18. ^ "tnefDD". SourceForge.net. Retrieved December 23, 2017.
  19. ^ (mij@macports.org), Jim Mock. "The MacPorts Project -- Available Ports". www.MacPorts.org. Retrieved December 23, 2017.
  20. ^ . Restoroot.org. Archived from the original on November 2, 2006. Retrieved December 23, 2017.
  21. ^ "Winmail File Viewer on the App Store". App Store. Retrieved January 8, 2018.
  22. ^ "WinMail.dat Viewer for OS 10 on the App Store". App Store. July 11, 2017. Retrieved January 8, 2018.
  23. ^ "Winmail Viewer for iPhone and iPad on the App Store". App Store. July 12, 2017. Retrieved January 8, 2018.
  24. ^ "Klammer on the App Store". App Store. Retrieved January 8, 2018.
  25. ^ "WinDat Opener on the App Store". App Store. Retrieved January 8, 2018.
  26. ^ "Connecting to the iTunes Store". iTunes.apple.com. Retrieved January 8, 2018.
  27. ^ "TNEF's Enough". App Store. February 2, 2020. Retrieved March 17, 2020.
  28. ^ a b "Winmail.dat Reader - Open winmail.dat files (Freeware)". www.Winmail-dat.com. Retrieved December 23, 2017.
  29. ^ "Winmail Opener - freeware utility for opening winmail.dat and other TNEF-encoded files". www.Eolsoft.com. Retrieved December 23, 2017.
  30. ^ Petersen, Frank. "tnef(TO)win, convert mstnef-attachments". www.Petersen.de. Retrieved December 23, 2017.
  31. ^ "PDF, DOC, DOCX, DAT, BIN, PHP Viewer - FreeFileViewer". www.FreeFileViewer.com. Retrieved December 23, 2017.
  32. ^ . www.Fentun.com. Archived from the original on November 26, 2004. Retrieved December 23, 2017.
  33. ^ "Get Winmail.dat Viewer - Letter Opener - Microsoft Store". Microsoft Store. Retrieved December 23, 2017.
  34. ^ "Tools / TNEF Extractor · GitLab". Retrieved June 22, 2020.
  35. ^ "Winmail.dat Opener". Google.com. Retrieved December 23, 2017.
  36. ^ grapph.com, Milos Wikarski. "Free Online Document Converter". doc2any.Grapph.com. Retrieved December 23, 2017.
  37. ^ "Online version - Winmail.dat Reader". www.Winmail-dat.com. Retrieved December 23, 2017.
  38. ^ "MS-TNEF degenerator". tud.at. Retrieved December 23, 2017.
  39. ^ "www.winmaildat.com". Winmaildat.com. Retrieved December 23, 2017.
  40. ^ "the-computer-site.com - The Computer Site - Extract Attachments from WINMAIL.DAT files". The-Computer-Site.com. Retrieved December 23, 2017.
  41. ^ "JTNEF - Java TNEF package". www.FreeUtils.net. Retrieved January 8, 2018.
  42. ^ "POI-HMEF - Java API To Access Microsoft Transport Neutral Encoding Files (TNEF)". poi.Apache.org. Retrieved January 8, 2018.
  43. ^ "MVCOM - MAPI-Free COM component for Outlook .pst, .msg, .ost". www.Encryptomatic.com. Retrieved January 8, 2018.
  44. ^ "Convert::TNEF - Perl module to read TNEF files - metacpan.org". Metacpan.org. Retrieved January 8, 2018.
  45. ^ "tnefparse: a TNEF decoding library written in python, without external dependencies". October 18, 2017. Retrieved January 8, 2018 – via GitHub.
  46. ^ Sheikh, Farrukh. "Outlook Alternative - Email APIs for .NET Java Android SharePoint Cloud". www.Aspose.com. Retrieved January 8, 2018.
  47. ^ "IMAP4 Component, POP3 Component, Email Parser for C#, VB, C++, Delphi - Retrieve Email, Parse Email, Decrypt Email, S/MIME, Parse winmail.dat, TNEF, Parse Outlook Msg, SSL, TLS". www.EmailArchitect.net. Retrieved January 8, 2018.
  48. ^ Murphy, John. "node-tnef". Retrieved August 31, 2018.
  49. ^ "MimeKit.Tnef Namespace". www.mimekit.net. Retrieved December 22, 2022.
  50. ^ "github.com/QualityUnit/TNEFDecoder". GitHub.

External links edit

  • Specification:
    • "M-OXTNEF: Transport Neutral Encapsulation Format (TNEF) Data Algorithm" - MS-TNEF format specifications
  • Microsoft Support:
    • "How e-mail message formats affect Internet e-mails in Outlook" - How to disable TNEF in Outlook 2002 and 2003
    • "Description of Transport Neutral Encapsulation Format (TNEF) in Outlook 2000" - How to disable TNEF in Outlook 2000
    • "How to configure Internet e-mail message formats at the user and the domain levels in Exchange Server 2003" - Includes instructions on disabling TNEF
  • Other:
    • "Microsoft Outlook MS-TNEF handling (aka Winmail.dat or 'Part 1.2' problem of unopenable email attachments)"

May 07, 2024
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Transport Neutral Encapsulation Format or TNEF is a proprietary email attachment format used by Microsoft Outlook and Microsoft Exchange Server An attached file with TNEF encoding is most often named winmail dat or win dat and has a MIME type of Application MS TNEF The official IANA media type however is application vnd ms tnef 1 Contents 1 Overview 2 Exchange Server 3 Decoding 3 1 Multiplatform 3 2 Unix like or POSIX command line 3 3 Mac 3 4 iPhone and iPad 3 5 Microsoft Windows 3 6 Android 3 7 Online 3 8 Software libraries 4 References 5 External linksOverview editSome TNEF files contain information used only by Outlook to generate a richly formatted view of the message such as embedded OLE documents or Outlook specific features such as forms voting buttons and meeting requests Other TNEF files may contain files which have been attached to an e mail message Within the Outlook e mail client TNEF encoding cannot be explicitly enabled or disabled except via a registry setting 2 Selecting RTF as the format for sending an e mail implicitly enables TNEF encoding using it instead of the more common and widely compatible MIME standard When sending plain text or HTML format messages some versions of Outlook apparently including Outlook 2000 3 prefer MIME but may still use TNEF under some circumstances for example if an Outlook feature requires it 3 4 TNEF attachments can contain security sensitive information such as user login name and file paths 3 4 from which access controls could possibly be inferred Exchange Server editThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed April 2010 Learn how and when to remove this message Native mode Microsoft Exchange 2000 organizations will in some circumstances send entire messages as TNEF encoded raw binary independent of what is advertised by the receiving SMTP server As documented in Microsoft KBA 323483 5 this technique is not RFC compliant because these messages have the following characteristics They may include non ASCII characters outside the 0 127 US ASCII range The lines in these messages are often too long for transport via SMTP They do not follow the CRLF CRLF message termination semantics as specified in RFC 821 Internal communications between Exchange Servers 2000 and later over SMTP encode the message in S TNEF Summary TNEF format The conversion between the format needed by the end client on the Internet is performed on the last Hub Transport server before final delivery and when the Hub Transport role of an Exchange Server is about to deliver the message to a mailbox role server the message is converted to MAPI format for storage S TNEF differs from TNEF in that it is 8 bit not 7 bit for TNEF and does not contain a plain text portion Decoding editPrograms to decode and extract files from TNEF encoded attachments are available on many platforms Multiplatform edit Geary email client supports TNEF since version 3 33 1 TNEF Parse Claws Mail plugin 6 LookOut 7 or its successor LookOut fix version 8 Mozilla Thunderbird extension See also LookOut project page at MozDev org 9 Bug 77811 Inline viewer for Microsoft proprietary mail formats a 21 plus year old bug report at the Mozilla Bugzilla 10 Wireshark Version 1 2 and later can open and dissect winmail dat files although it is not useful as a mail reader Unix like or POSIX command line edit yTNEF GPL TNEF extractor from the POSIX command line designed specifically for reading winmail dat 11 TNEF GPL TNEF extractor from the POSIX command line 12 KTNEF GPL TNEF extractor by KDE 13 Mac edit Klammer Shareware for Mac OS X available on App store also supports MSG files 14 MailRaider Pro Application for Mac OS X available on App store also supports MSG files 15 Winmail Viewer Shareware Winmail dat viewer for Mac OS X 10 6 or later available on App Store support open Microsoft Outlook 1997 2000 2003 2007 2010 Winmail dat files can extract and save Winmail dat attachments 16 TNEF s Enough Freeware decoder for Mac OS 9 and Mac OS X 17 tnefDD Free GPL decoder with drag and drop functionality for Mac OS X 18 TNEF MacPorts version of the TNEF command line decoder Mac OS X 19 Letter Opener previously known as OMiC Shareware plugin for Apple Mail 20 iPhone and iPad edit Winmail File Viewer Paid universal app for the iPhone iPod Touch and iPad to open winmail dat attachments with option to save and share extracted files 21 WinMail dat Viewer Browse Outlook winmail dat files Paid universal app for the iPhone iPod Touch and iPad to open winmail dat attachments with option to view save and share extracted files 22 Winmail File Viewer Paid universal app for the iPhone iPod Touch and iPad to open winmail dat attachments with option to save and share extracted files 23 Klammer open EML MSG and Winmail dat files Paid universal app for the iPhone iPod Touch and iPad with in app purchase to provide functionality 24 WinDat Opener Paid app for the iPhone iPod Touch and iPad 25 Letter Opener Free Universal app for the iPhone iPod Touch and iPad with in app purchase to provide functionality 26 TNEF s Enough Free Universal app for iPhone iPod Touch and iPad 27 Microsoft Windows edit Winmail dat Reader Freeware easy to use decoder 28 Winmail Opener Freeware decoder 29 tnef2win Freeware decoder 30 Free File Viewer Freeware decoder 31 fentun Freeware decoder 32 Winmail dat Viewer modern Windows 8 app non free 33 Android edit TNEF Extractor A free and open source GPLv3 Android app 34 Opener A free Android app 35 Reader Free Android app also available 28 Online edit winmail dat extractor and document converter Free in modern responsive theme 36 Reader Online The online version of the Winmail dat Reader free 37 tud at service Web service and GPL licensed PHP script for reading attachments in winmail dat files 38 www winmaildat com Another online winmail dat extractor which allows to upload up to 5 MB 39 the computer site com converts winmail dat file to a zip file 40 Software libraries edit JTNEF GPL Java TNEF package 41 POI HMEF Java library of the Apache POI project 42 MVCOM Commercial COM component to parse TNEF 43 Convert TNEF TNEF library written in Perl 44 tnefparse library TNEF access library written in Python licensed under LGPL 45 Aspose Email Commercial Java and NET library that can parse and extract TNEF data 46 EAGetMail Component Commercial NET and ActiveX library that can parse and extract TNEF data 47 node tnef NodeJS command line tool library that can parse and extract TNEF data 48 libytnef GPL TNEF extractor library written in C 11 MimeKit A NET MIME creation and parser library with support for TNEF 49 TNEF Decoder A PHP Library to extract TNEF 50 References edit Some Microsoft Media Types for registration IANA Retrieved October 25 2010 When you use Outlook 2007 to send an e mail message the recipient of the message sees an attachment that is called Winmail dat Microsoft July 29 2009 Retrieved March 3 2011 a b c Description of Transport Neutral Encapsulation Format TNEF in Outlook 2000 Microsoft Archived from the original on September 4 2009 Retrieved September 11 2009 a b How e mail message formats affect Internet e mails in Outlook Microsoft March 30 2005 Retrieved October 13 2006 Microsoft KBA 323483 Claws Mail Plugins www Claws Mail org Retrieved December 23 2017 LookOut addons Mozilla org September 30 2011 Retrieved December 23 2017 LookOut fix version addons Mozilla org Retrieved December 23 2017 mozdev org lookout index lookout MozDev org Retrieved December 23 2017 77811 Inline viewer for Microsoft proprietary mail formats ms tnef etc winmail dat bugzilla Mozilla org Retrieved December 23 2017 a b Yeraze November 21 2017 ytnef Yeraze s TNEF Stream Reader for winmail dat files Retrieved December 23 2017 via GitHub Simpson Mark December 8 2017 tnef Retrieved December 23 2017 via GitHub KTnef SourceForge November 15 2015 Retrieved December 23 2017 Klammer on the Mac App Store Mac App Store Retrieved December 23 2017 MailRaider Pro on the Mac App Store Mac App Store Retrieved December 23 2017 Winmail Viewer Open and Read Winmail dat Files on the Mac App Store Mac App Store Retrieved December 23 2017 Josh Jacob TNEF s Enough www JoshJacob com Retrieved December 23 2017 tnefDD SourceForge net Retrieved December 23 2017 mij macports org Jim Mock The MacPorts Project Available Ports www MacPorts org Retrieved December 23 2017 Letter Opener Restoroot org Archived from the original on November 2 2006 Retrieved December 23 2017 Winmail File Viewer on the App Store App Store Retrieved January 8 2018 WinMail dat Viewer for OS 10 on the App Store App Store July 11 2017 Retrieved January 8 2018 Winmail Viewer for iPhone and iPad on the App Store App Store July 12 2017 Retrieved January 8 2018 Klammer on the App Store App Store Retrieved January 8 2018 WinDat Opener on the App Store App Store Retrieved January 8 2018 Connecting to the iTunes Store iTunes apple com Retrieved January 8 2018 TNEF s Enough App Store February 2 2020 Retrieved March 17 2020 a b Winmail dat Reader Open winmail dat files Freeware www Winmail dat com Retrieved December 23 2017 Winmail Opener freeware utility for opening winmail dat and other TNEF encoded files www Eolsoft com Retrieved December 23 2017 Petersen Frank tnef TO win convert mstnef attachments www Petersen de Retrieved December 23 2017 PDF DOC DOCX DAT BIN PHP Viewer FreeFileViewer www FreeFileViewer com Retrieved December 23 2017 Welcome to Fentun s Home Page www Fentun com Archived from the original on November 26 2004 Retrieved December 23 2017 Get Winmail dat Viewer Letter Opener Microsoft Store Microsoft Store Retrieved December 23 2017 Tools TNEF Extractor GitLab Retrieved June 22 2020 Winmail dat Opener Google com Retrieved December 23 2017 grapph com Milos Wikarski Free Online Document Converter doc2any Grapph com Retrieved December 23 2017 Online version Winmail dat Reader www Winmail dat com Retrieved December 23 2017 MS TNEF degenerator tud at Retrieved December 23 2017 www winmaildat com Winmaildat com Retrieved December 23 2017 the computer site com The Computer Site Extract Attachments from WINMAIL DAT files The Computer Site com Retrieved December 23 2017 JTNEF Java TNEF package www FreeUtils net Retrieved January 8 2018 POI HMEF Java API To Access Microsoft Transport Neutral Encoding Files TNEF poi Apache org Retrieved January 8 2018 MVCOM MAPI Free COM component for Outlook pst msg ost www Encryptomatic com Retrieved January 8 2018 Convert TNEF Perl module to read TNEF files metacpan org Metacpan org Retrieved January 8 2018 tnefparse a TNEF decoding library written in python without external dependencies October 18 2017 Retrieved January 8 2018 via GitHub Sheikh Farrukh Outlook Alternative Email APIs for NET Java Android SharePoint Cloud www Aspose com Retrieved January 8 2018 IMAP4 Component POP3 Component Email Parser for C VB C Delphi Retrieve Email Parse Email Decrypt Email S MIME Parse winmail dat TNEF Parse Outlook Msg SSL TLS www EmailArchitect net Retrieved January 8 2018 Murphy John node tnef Retrieved August 31 2018 MimeKit Tnef Namespace www mimekit net Retrieved December 22 2022 github com QualityUnit TNEFDecoder GitHub External links editSpecification M OXTNEF Transport Neutral Encapsulation Format TNEF Data Algorithm MS TNEF format specifications Microsoft Support How e mail message formats affect Internet e mails in Outlook How to disable TNEF in Outlook 2002 and 2003 Description of Transport Neutral Encapsulation Format TNEF in Outlook 2000 How to disable TNEF in Outlook 2000 How to configure Internet e mail message formats at the user and the domain levels in Exchange Server 2003 Includes instructions on disabling TNEF Other Microsoft Outlook MS TNEF handling aka Winmail dat or Part 1 2 problem of unopenable email attachments Retrieved from https en wikipedia org w index php title Transport Neutral Encapsulation Format amp oldid 1212890173, wikipedia, wiki, book, books, library,

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