MSG to EML Converter

Because a .msg is not a mail message in the standard sense. Internet mail is plain text with headers, the format .eml files use, while a .msg is a Compound File Binary container, the same little file system Microsoft used for old .doc and .xls files. Inside it, every field of the message sits in its own stream identified by a MAPI property number. Nothing else on your computer speaks that layout, which is why the file looks opaque without Outlook.

EML is the message as it travelled: headers, body and attachments in the text format defined by RFC 5322, readable by every mail client and by a text editor. MSG is how Outlook stores a message on disk, in a binary container that also keeps Outlook-specific data such as flags and categories. Converting to EML keeps everything that belongs to the message itself and drops what only meant something inside Outlook.

In up to three different places, which is why some tools show you an empty message. Outlook writes the plain text body only when the message has one; an HTML message keeps its body in a property called PR_HTML, and a Rich Text one in PR_RTF_COMPRESSED, which is compressed with an algorithm of its own. This tool reads the plain text and the HTML, prefers the HTML for the .eml so your mail client renders the message as written, and says explicitly when a body is Rich Text rather than leaving you looking at a blank pane.

Yes. They are pulled from the attachment sub-storages and base64 encoded into the .eml as MIME parts, which is how mail carries binary files, so opening the .eml in any client shows them attached. Each one is also offered as a separate download, because most of the time the attachment is the reason you opened the file at all.

No. The container is parsed by JavaScript in your browser tab. This matters because a .msg is usually work correspondence: sender, recipients, full text and attachments in one file. Every online converter that asks you to upload it receives all of that, which is a lot to hand over to read one email.

Yes. EML is the standard mail format, plain RFC 822 text with MIME parts, and every mail client reads it: a double click opens it in the desktop client, Thunderbird and Apple Mail can import it into folders, and webmail accepts it as an attachment. That portability is the whole point of converting away from .msg.

No. If you just need the content, the viewer opens the .msg directly in the browser and shows body, headers and attachments without producing any new file. Convert to .eml when you need a file that other mail programs can keep and open later. MSG Viewer