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Univik Online MBOX Viewer
100% private. Runs only on your device
Open old In.mbx, Out.mbx and Trash.mbx files on today's devices. Nothing to install and the file never leaves your machine.
Or pick it from your device. Messages open in this tab, on your own computer, phone or tablet. Your mailbox is never uploaded.
Eudora saved each mailbox as a .mbx file. Open one of those files in this tool and the browser reads it straight from your disk, so a mailbox you have kept for twenty years stays on your own computer.
Point it at In.mbx, Out.mbx or any Eudora mailbox. Your browser splits the file into messages on your own machine.
Qualcomm discontinued Eudora in 2006 after version 7.1, and the Thunderbird based Eudora OSE of 2010 did not last either. Mac users of the same era often have Entourage exports beside their Eudora files. You do not have to find or install any of them. Open the old .mbx file here on a current computer or phone.
The viewer is this one page. Once it is open you can switch off the network and still read every message.
Save a message as .eml so it opens in Outlook, Thunderbird or Apple Mail. A good way to rescue mail out of a dead program.
Short answer: move the .mbx onto whatever device you are using, then load it into this tool. It works in the browser on Windows, Mac, Linux, ChromeOS, iOS and Android.
Find the Eudora data folder, drag In.mbx or Out.mbx out to a working folder and load it here in any modern browser. This is where most old Eudora mail still lives.
Classic Mac Eudora mail moved to a modern Mac opens here in Safari or Chrome. Old Mac line breaks are handled for you.
A .mbx file is plain mbox text, so it opens in any Linux browser. No mail client setup is needed.
Get the .mbx onto the phone through a share link or a cloud folder, then load it in the mobile browser. Read a twenty year old thread on the train.
ChromeOS cannot open a .mbx on its own, so this page stands in. Load it straight from Drive or a downloaded copy.
Qualcomm's Eudora used its own take on the mbox format, the mboxo variant. The viewer knows the quirks and reads each message the way Eudora meant it, with no import into another email client.
Eudora wrote the constant ???@??? on the separator line in place of the address, so every message starts with From ???@???. The tool reads the real From header, so the list shows who each message is actually from.
Eudora uses the older mboxo shape and does not add a blank line between messages. PocoMail wrote .mbx files the same way, and Opera Mail's .mbs files are another extension on the same idea. The viewer finds each real message start and splits the file at the right spots.
A .mbx from an old Mac uses a bare carriage return, the CR line ending, at the end of each line. The viewer converts those, so the file opens as separate messages instead of one long block.
Old Eudora saved attachments as separate files in an Attach folder, so a message may name a file that is not inside the .mbx. The viewer shows what is embedded and lists the rest from the headers.
Subjects held in an encoded form are decoded and shown as plain text, so old mail in any language reads correctly.
Message-ID, Received, Date and the rest of the raw headers are shown unchanged in the Headers tab, useful for checking an old thread.
In the Eudora data folder the mailboxes are In.mbx, Out.mbx, Trash.mbx and any you made. The file that ends in .toc next to them is an index, not mail.
Drop the .mbx onto the upload box or tap Choose files. Eudora messages appear in the list as the file is parsed on your machine.
Open any message, flip to the Headers or Attachments tab and export it as .eml when you want to move it into a current mail app.
Eudora stored each mailbox as its own file. Here is what you are looking for.
Eudora 6 and 7 kept the data folder under Application Data\Qualcomm\Eudora, older versions under Program Files. Otherwise it is Documents\Eudora or the Eudora program folder. Mailboxes are In.mbx, Out.mbx, Trash.mbx, Junk.mbx on later versions and any you added. Each has a matching .toc beside it.
The Eudora Folder holds the mailboxes. The table of contents lived in the file resource fork or an old style .toc. Only the mailbox itself needs to come across to open here.
An Attach folder next to the mailboxes holds files that arrived with messages. Keep it if you want those originals, since old Eudora did not store them inside the .mbx.
A .mbx is plain text. Copy it to any computer or phone with a drive or a cloud folder and open it on this page. The .toc index does not need to come with it.
Two tools, one job done two ways. The online tool here reads a single .mbx anywhere a browser runs. To open a whole folder of old mailboxes at once, dig through the message text or print in volume, install the free Univik MBOX Viewer for Windows.
| Feature | Online Eudora Viewer | MBOX Viewer for Windows |
|---|---|---|
| Install needed | None, opens in the browser | 15 MB Windows setup |
| Operating system | Windows, Mac, Linux, Chromebook, iOS, Android | Windows 7 to 11 |
| Files uploaded | Never, runs on your device | Never, runs on your PC |
| Eudora .mbx files | One file at a time | A whole folder of mailboxes |
| Search | Sender, subject, recipients | Message bodies too |
| Large mailboxes | Read in pieces, multi GB files open | No size limit |
| Browser print of the open message | Direct printing | |
| Price | Free | Free |
Yes. This page reads the .mbx file on its own. Move the mailbox to any current computer or phone, load this page and choose it. You do not need to hunt down a copy of Eudora.
Eudora wrote ???@??? on the separator line instead of the real address. The tool does not rely on that line. It reads the From header inside the message, so the list shows the true sender. You only see ???@??? if a message has no From header at all.
The .toc file is Eudora own table of contents, a small index it used to jump around the mailbox. It holds no mail. Open the .mbx file and leave the .toc where it is.
Old Mac files use a CR line break that many tools do not split on. This viewer spots the CR ending and converts it first, then splits the mailbox into separate messages. The count then matches what you saw in Eudora.
Old Eudora kept attachments as separate files in an Attach folder rather than inside the mailbox. So a message may name a file that is not in the .mbx. Look in the Attach folder next to your mailboxes for those originals.
No. Everything the tool does runs inside your browser and nothing is sent anywhere. There is no server behind this and no login. Pull the network cable and your old mail still opens.
Yes. In.mbx is plain text, so move it across with AirDrop, a USB drive or a shared folder. Load this page on the Mac or phone and choose the file. Eudora never has to touch that device.
Open the .mbx here, then save the messages you care about as .eml. An .eml file opens in Outlook, Thunderbird and Apple Mail, so you can drag your old mail straight into a program you still use.
Twenty year old mail, readable in a minute. The .mbx stays on your computer the whole time.
Choose a .mbx file