Category: Outlook to .eml

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Converting Outlook Email To .EML

EML Viewer Pro is a software tool for Windows 11/10. It lets you manage directories of  EML files, which are individual email messages that may contain file attachments. If you have hundreds or thousands of EML files that you need to search and convert to different formats such as PDF, then EML Viewer Pro (also known as Pst Viewer Pro or MailDex) is a solid tool for that task.

But what if you are a Microsoft Outlook user and you want to convert your Outlook email messages into the open EML file format?   Microsoft does not natively support converting email into .eml files. Fortunately this task is easily accomplished by downloading the MessageExport add-in for Microsoft Outlook.

MessageExport will install directly to the Outlook toolbar. It is compatible with Outlook 2003, 2007, 2010 and the upcoming 2013, both 32 and 64-bit.

To use MessageExport, first select the email messages in the mail list that you want to convert into .eml files.

Image of Outlook toolbar shows how to convert email to .eml conversion.
Convert Outlook email to .eml files

Next, choose “Export to EML” from the drop down list.  Finally, click the blue “Export” button to begin the eml conversion process. You may be prompted to select a folder where the .eml files can be stored.  MessageExport can convert one, hundreds or thousands of Outlook emails into .eml files.

The .eml files that are produced can be opened with EML Viewer Pro, or with any email software that supports the RFC-822 EML file format (which most do).

There are many, many other options in MessageExport. For example you can have it automatically convert email into .eml files on a scheduled basis. You setup a specific naming scheme based on information in the email. You can also export to msg, pdf, and other formats.

Click here to learn more about MessageExport and download a free trial. The free trial runs for 15 days. After that you can continue to use MessageExport to convert individual email messages to .eml or any of the many other formats that it supports.

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How to Export Outlook Email to .eml or .mbox Format

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What are .PST and .MBOX files?

Pst files and Mbox files both email messages.  While PST files proprietary to Microsoft Outlook, Mbox is an open specification used by email clients such as Mozilla Thunderbird.  RFC-822 and subsequently RFC-2822 are the open specifications documents that describe internet messaging and embody the structure of .eml files.   An MBOX file is a “mailbox” file which contains a collection of RFC-2822 email.  So .MSG is to .EML what .PST is to .MBOX.

RFC-822 was not directly adopted by Microsoft Outlook, the leading email client software in the world. Outlook email messages are stored in a single .PST file which may contain thousands of individual emails, messages including their file attachments. The specification for  creating a .pst file is proprietary, and is determined by Microsoft Corporation. The .pst specification was closed until Microsoft began publishing parts of the specification in 2010.
When Outlook exports a single email item from a .pst file, it is saved as a .msg file, which is also a proprietary Microsoft specification. Outlook .msg and .pst files requires Microsoft Outlook, or an Outlook viewer such as PST Viewer Pro.
Emails within a .mbox mailbox are concatenated and stored as in plain text. The start of a message within the .mbox file is delineated by a line with the word “From” followed by a space and the return path e-mail address.
Because RFC-822/2822 is an open specification it has been adopted by email client software such as Mozilla Thunderbird. It is still used to store and exchange email messages. Some companies prefer to store emails in this open standard, rather than in a proprietary standard.

Exporting Outlook to .EML/.MBOX

Microsoft Outlook does not directly support exporting email messages from a .pst or .msg files to .mbox or .eml files. To do this requires a third party add-in extension to Microsoft Outlook.
MessageExport is a useful add-in for Microsoft Outlook for exporting email messages to formats that missing from Outlook. MessageExport integrates tightly with Outlook’s main toolbar to allow users to select email messages from within Outlook and then export the emails directly to .eml or .mbox format.
Choosing the "Export to .eml" email export function.
Export to .EML from Outlook toolbar
In addition to .eml and .mbox, MessageExport also adds other export formats to Outlook, such as .pdf, .msg, mhtml, gif, tif, text, html, and many others.
Image shows dozens of email export operations that can be performed by MessageExport add-in for MS Outlook.
Export formats included with MessageExport
To export Outlook emails to PDF with MessageExport, click a message or messages in the Outlook message list so that they are highlighted. Next, select the export format from the MessageExport dropdown list (.eml or .mbox) and then click the Export button.  MessageExport may ask you to select a target folder, and once done will begin to export the selected emails.
If you export to .mbox, then all of your selected Outlook emails will be in a single .mbox file.
If you export to .eml, then you will have one .eml file for each Outlook email that was selected.
MessageExport also includes a “drag and drop” conversion capability.  Using MessageExport’s Export Folder Explorer, you can immediately convert a message to the selected format just by dragging that file and dropping on a folder in the explorer.
Drag and drop email conversion from MS Outlook.
Export folder explorer in closed state, resides on the right-hand side of the Outlook window. To use it, click to expand.
Selecting the appropriate folder for despositing email that has been converted.
Export folder explorer in expanded state.  Drag and drop email messages on the selected folder to immediately convert it to the currently selected format.
 MessageExport is a useful add-in for convert Outlook email message to .eml, .mbox, .pdf and other formats that are not natively included with Microsoft Outlook.  You can download a free 15 day trial of MessageExport.