Univik Pegasus Converter for Windows
At a Glance
Key Features
Mailbox Folder Layout Kept
New Mail, sent, drafts and each folder you created keep the same shape they had in Pegasus. What you open afterward still looks like your mailbox, not a single pile of loose messages.
At a Glance
Univik Pegasus Converter at a Glance
The figures worth checking before you download, set out to read fast.
7
Pegasus File Types
Reads PMM, CNM, PNM, PML, PMF, PMC and PMI, the files a Pegasus mailbox leaves on disk.
5
Output Formats
Write mail to Outlook PST, or to EML, MBOX, PDF, HTML, TEXT or CSV for other apps. It can also send mail to Office 365, Gmail, IMAP or Thunderbird.
0
Files Uploaded
The work happens on your own machine start to finish, so private mail stays yours.
1
Run per Mailbox
Batch mode clears an entire PMAIL folder in one go.
$39
One-Time Licence
Test it free, then pay once. No subscription, and a 30-day refund window.
Key Features
What Univik Pegasus Converter Does
The small things decide whether a converted mailbox is any use. These are what it gets right.
Attachments Stay Attached
Whatever was sent with a message travels with it, and the sender, recipient, subject and date come with it too, so no converted email arrives incomplete.
Reads Every Message, Nothing Dropped
Pegasus splits mail two ways: single CNM files in the New Mail folder and PMM stores with a PMI index. The tool reads both, including the CNM files some converters skip or stop on, so the count that goes in matches the count that comes out.
Convert Only What You Pick
Open the mailbox and tick only the folders that matter. Nothing makes you push years of mail through to rescue one folder. The tool leaves the rest alone.
Clean Output Naming
Each message is named from its sender, subject and date, then filed into folders that mirror the mailbox, so a large job finishes tidy rather than scattered.
Originals Never Touched
Your Pegasus files are only ever read. New output is written to a folder you choose, leaving the original mailbox untouched and safe.
The Quick Reason
Why Pegasus Files Open Nowhere Else
Pegasus Mail stores email in file types built for itself alone, which no ordinary program reads. Two hurdles keep that mail locked away.
Trap 1: A Closed Set of Formats
PMM, CNM and the other Pegasus types are made for one program. Outlook, Thunderbird and PDF readers cannot open them. The common advice is to keep Pegasus Mail running, which is no help once it is gone from the PC.
Trap 2: Mail Split Across Files
Pegasus keeps New Mail as single CNM files but saves folders as PMM stores with a separate PMI index. There is no simple built-in way to export the lot at once, and copying files by hand loses the folder layout.
Univik Pegasus Converter software reads the mailbox files on its own and writes them out in shapes a modern email app understands. It handles each CNM message, walks the PMM stores through their PMI index and holds the folder layout the whole way. At no stage does the old software have to be present.
Inside the Mailbox
Inside the MailboxWhat a Pegasus Mailbox Leaves Behind
Match the Pegasus file on your disk to what the tool makes of it.
PMM + PMI
Folder Mail and Its Index
Your saved folders live in PMM files, each paired with a PMI index that lists what is inside. This holds the bulk of a Pegasus mailbox, and the converter reads the PMM store and its index together.
CNM + PNM
New Mail Messages
Mail that landed in the New Mail folder is kept as one CNM file per message, with PNM as a close variant. Each filename is really a message ID, so you may see them written as CNN by some tools. The converter reads these single-message files straight from the folder.
PML, PMF, PMC
Lists and Filter Rules
These hold Pegasus extras rather than mail: PML keeps a distribution list of addresses, while PMF and PMC store filter rules. The converter reads the Pegasus file set so you can pull addresses and details out of a full mailbox copy.
Three Steps
Three StepsHow to Batch Convert Pegasus Mail Files
No Pegasus Mail. No old spare PC. No working through one file after another.
1
Load the Mailbox
Open lists the Pegasus Mail accounts already set up on the PC, so pick an IMAP or POP3 account and load it. Or choose the PMM, CNM, PNM, PML, PMF, PMC or PMI files and folders yourself.
2
Choose a Save Format
Going to Outlook? Save PST. Other apps take MBOX or EML. Pick PDF, HTML, TEXT or CSV for a fixed record. Or send the mail straight to Office 365, Gmail, an IMAP account or Thunderbird.
3
Run It and Read the Mail
Start the run, then open the results in whatever mail app you use today. Pegasus is not involved.
Get the Free Trial
Windows 11 and 10 · needs neither Pegasus Mail nor Outlook to run · everything stays local · backed by the team that wrote it
Real Situations
Real SituationsWhen You Need a Pegasus Mail Converter
Most people land here for one of these three reasons.
Moving to a New Email App
After years on Pegasus you have switched to Outlook or another client, and the old mail is stuck. Convert it to Outlook PST or MBOX or EML and each folder arrives intact, ready to read and search where you work now. Moved to the cloud? Our guide to importing Pegasus Mail into Office 365 covers the direct upload. The same works for moving Pegasus Mail to Gmail, folders arriving as labels. Staying on the desktop instead? Moving Pegasus Mail to Thunderbird can write straight into the Thunderbird profile.
Old Backups from a Retired PC
An old office PC left behind a PMAIL folder on some drive. Rather than look for a machine that still runs Pegasus, convert it once and the mail opens on the computer you use today.
Handing Old Mail to Someone Else
A client, a court or an auditor asks for mail from an old Pegasus account. Hand them a PDF or PST and it opens cleanly on any standard machine, reading the same for them as for you. The guide to exporting Pegasus Mail to PDF shows the one-file-per-message output and what to keep alongside it.
Old App, Locked Mail
When the Old PC Running Pegasus Is Gone
Why this matters
Pegasus Mail has been around since the early 1990s and many offices ran it for decades. When that PC is replaced or the program stops opening on modern Windows, the mail looks lost. It is not. The PMAIL folder on disk still holds every message.
The mail is still yours. A Pegasus mailbox normally lives in the PMAIL folder, often at C:\PMAIL\MAIL\[username], where the PMM stores, their PMI indexes and the CNM new-mail files all sit. Move that folder onto your new PC, aim the Univik Pegasus Converter tool at it and get back PST or EML you fully own, without the old machine and without an upload. Want to keep Pegasus running on the new machine instead? Our guide on moving Pegasus Mail to a new computer covers the copy-the-folder route step by step, and the Windows XP or 7 to Windows 11 guide handles the old machine that Windows 11 cannot see on the network. If the program itself refuses to start, see Pegasus Mail will not open for the four fixes before you convert.
Weigh the Routes
Three Ways out of Pegasus Files
Each path recovers part of the mail. Only one brings the whole mailbox over intact.
| What you need | Thunderbird + IMAP Route | Free Online Uploaders | Univik Pegasus ConverterTRIAL |
|---|---|---|---|
| Works without Pegasus installed | No | Yes | Yes |
| Batch a whole PMAIL folder | Folder by folder | One at a time | One run |
| Reads PMM, CNM and PMI direct | Needs manual export | Not always | Yes |
| Mail never leaves your PC | Sent through a server | Goes to their server | Yes |
| Keeps the folder layout | Often breaks | Rarely | Yes |
The manual route takes hours and can lose folders, and an upload site puts private mail on someone else’s server. One tool avoids both.
What You Need
Pegasus Converter System Requirements
Windows Version
Any 64-bit PC running Windows 11 or Windows 10 works. It relies on .NET Framework 4.8, bundled with recent Windows builds by default.
Pegasus Not Required
The software parses the Pegasus files itself. There is no Pegasus Mail to reinstall, no Outlook and no hunt for the old computer.
Memory and Disk
Most mailboxes run fine on 4 GB of memory. Use 8 GB when the store is very large or full of big attachments.
Works Fully Offline
You go online once to download the installer. After that the conversion runs with no network use.
| Software Information | Univik Pegasus Converter |
| Version | 6.8, current release |
| Licence | $39 one-time, following a free trial |
| Platform | 64-bit editions of Windows 10 and 11 |
| Framework | Requires .NET 4.8 or newer |
| Reads | PMM, CNM, PNM, PML, PMF, PMC and PMI files |
| Saves | Outlook PST, EML, MBOX, PDF, HTML, TEXT, CSV, Office 365, Gmail, IMAP and Thunderbird |
| File Format | Pegasus Mail mailbox files from the Windows and DOS versions |
Questions
Common Pegasus Converter Questions
Use a Pegasus Mail converter tool like Univik Pegasus Converter. PMM, CNM and the other Pegasus types are made for one program, so no everyday app reads them. It opens the files right on Windows 11 or 10 and rebuilds them as Outlook PST, or as MBOX, EML, PDF, HTML or CSV that a present-day email app can load. It can also send the mail straight into Office 365, Gmail or an IMAP account.
Yes. Working on its own, the software reads the PMM, CNM and PMI data and assembles a PST that Outlook loads. You skip both the Pegasus Mail install and the original PC, while the mailbox folder tree stays complete in the result.
Give it the PMAIL folder rather than a single file. The New Mail messages and the saved folders all line up together and convert in one pass. For moving a full old mailbox in a single run, this is the direct way.
Yes. Besides the file outputs, Univik Pegasus Converter moves the mail straight into a Microsoft 365 or Office 365 mailbox, a Gmail account or any IMAP account. It can also hand the mail to Thunderbird. You sign in to your own account and the folders upload in place, so the tool doubles as a Pegasus Mail to Office 365 or Gmail migration.
Yes. The Open menu lists the Pegasus Mail accounts already set up on the PC, such as an Admin, IMAP or POP3 account, so you can load one and convert it. You can also choose the PMM, CNM, PNM, PML, PMF, PMC or PMI files and folders yourself. Both routes give the same PST, MBOX, EML, PDF, HTML or CSV output.
Pegasus keeps mail in two ways. Each message in the New Mail folder is saved as its own CNM file, which some tools write as CNN, while saved folders are stored as PMM files with a matching PMI index. The Pegasus converter reads both styles, so you do not have to sort them out first.
No. Each message is copied with its attachments and its From, To, Subject and Date lines. The folder layout comes across too. The original Pegasus files are only read, never changed, so you can check the output and still have the source mailbox exactly as it was.
Yes. The PMAIL folder on disk still carries every message even if the program refuses to start. Move it onto your current machine and let the Univik Pegasus Converter tool process it. Back comes Outlook-ready PST or EML that opens right away.
No. Everything is processed locally on your Windows PC. An old mailbox usually mixes personal notes with work records. Running the job through installed software rather than a browser upload box is what keeps that content off other people’s servers.
The converter reads Pegasus mailbox files from the long-running Windows versions and the older DOS releases. Pegasus Mail has been developed by David Harris since the early 1990s, and files from across those years convert the same way.
No. The Univik Pegasus Converter software runs as a self-contained Windows program. Reading your files calls for none of Pegasus Mail, Outlook, Office or a paid Microsoft 365 plan. The one moment Outlook matters is later, and only when PST is the format you saved to.
Look in the PMAIL folder, commonly at C:\PMAIL\MAIL and then a subfolder carrying the user name. That holds the PMM stores, their PMI indexes and the CNM new-mail files. Since Pegasus is portable, the folder can also live on a USB stick or a path you picked, so the About screen in Pegasus shows exactly where the mailbox sits. If you once made a folder in Unix Mailbox Format, those messages sit in .MBX files in the same area, and the tool reads them too.
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Fact Checked
Since 2013 Univik has built tools that read closed email formats and convert them, and our team authored and reviewed this page. The details here were checked against the official Pegasus Mail project run by David Harris at pmail.com and its community documentation. That covers how PMM and PMI pair up, what the CNM new-mail files are, what PML and PMF hold and where the PMAIL folder sits on disk.
“Every IMAP and POP3 account we had configured in Pegasus loaded straight from the Open menu and converted with no errors.”
Since 2013Format VerifiedUnivik Team