Cloud Migration Guide
By To move Pegasus Mail to Gmail, take the user folder out of C:\PMAIL\MAIL, feed it to a tool that can read PMM and CNM files, choose Gmail, sign in to the account and run. Every Pegasus folder becomes a Gmail label of the same name and the messages keep their dates. Gmail's own import cannot read Pegasus files, and the IMAP copy from inside Pegasus works but goes one folder at a time. Mind the 15 GB free limit and use an app password if 2-Step Verification blocks the sign-in.
Plenty of people ran Pegasus Mail for years and then switched to Gmail for everything new, leaving the old mail marooned on one PC. Gmail has an import feature, but it pulls from another live account and knows nothing about the .PMM and .CNM files Pegasus leaves on disk. So the old mail needs a bridge.
The four steps below use a converter as that bridge and upload the folders straight into the Gmail account. Further down are the two things people usually ask next, how folders become labels and how much room Gmail gives you, plus the IMAP route for anyone who prefers to do it by hand.
Can Gmail Import Pegasus Mail on Its Own?
No. Gmail's Import mail and contacts tool, under Settings, See all settings, Accounts and Import, connects to another working email account and fetches messages over POP. It is built for moving from Yahoo or an old ISP mailbox, not from files on a hard drive. Pegasus Mail, on the other side, has no Gmail export and no idea what a label is.
So something has to read the Pegasus files and speak to Gmail. Univik Pegasus Converter does exactly that: it opens the mailbox files on your PC, signs in to the Gmail account you choose and creates the labels and messages there. That is the route in the steps that follow. The IMAP copy is the manual alternative and gets its own section.
How Do I Move Pegasus Mail to Gmail?
Here is the whole job, from a folder on the old PC to labels in the inbox. Allow half an hour, more for a large archive on a slow line.
Get hold of the Pegasus user folder
Close Pegasus Mail. Under C:\PMAIL\MAIL there is one folder per user, and that folder is the mailbox: .PMM files for each folder, .PMI indexes and single .CNM files for unread mail. Copy it to the PC you will work from. It does not have to be the old machine, and Pegasus does not have to be installed there.
Point Univik Pegasus Converter at it
Run the converter and click Open. Browse to the copied user folder. If you are still on the original PC, the Open menu also lists the Pegasus accounts set up there. The mailbox loads with its folder tree. Untick anything you do not want online, such as old newsletters, before you go on. The trial lets you send a small sample first to see how the labels come out.
Pick Gmail as the destination and sign in
Choose Gmail from the output list and sign in with the Google account that will receive the mail. If Gmail turns down your normal password and you have 2-Step Verification on, create an app password at myaccount.google.com/apppasswords and use that instead. Our Gmail settings guide walks through it. The mail goes only to this account.
Run it and check the labels in Gmail
Start the upload. Gmail has labels rather than folders, so each Pegasus folder arrives as a label of the same name, with nested folders shown as Parent/Child. Messages keep their original dates and attachments. When the run ends, open the inbox, look down the left-hand label list and the Pegasus folders are there. A big mailbox takes as long as your upload speed allows.
How Do Pegasus Folders Become Gmail Labels?
Gmail does not have folders. It has labels, and a message can carry more than one. When the upload creates a label called Clients and tags every message from the Pegasus Clients folder with it, clicking that label in Gmail shows the same set of mail the folder held. A folder nested inside another comes across as Parent/Child, which Gmail shows as a nested label in the left-hand list.
Two small things to know. Gmail may also file uploaded messages under All Mail and, for anything with a Pegasus sent date, under Sent, because it decides those by the message headers. And labels are case-sensitive, so a folder called Invoices and one called invoices become two labels. Neither is a problem, but both surprise people the first time.
Is There Enough Space in Gmail for a Pegasus Archive?
A free Google account comes with 15 GB, and that pool is shared between Gmail, Google Drive and Google Photos. A personal Pegasus mailbox is usually a few hundred megabytes and fits with room to spare. A small business archive with twenty years of attachments can run to many gigabytes and may not.
Check before you start. Right-click the Pegasus user folder in File Explorer, choose Properties and read the size. Compare it with the free space shown at the bottom of the inbox page or in Google One. If it is tight, add storage. Or untick the heaviest folders in the converter and keep those as a PST or MBOX archive on disk instead.
What About Copying to Gmail over IMAP?
The do-it-yourself route is to add Gmail to Pegasus Mail as an IMAP account, using imap.gmail.com on port 993 with an app password, and then copy each folder from the local mailbox into the Gmail account. Pegasus pushes the messages up and the messages land under labels named after the folders. It costs nothing and needs no extra software.
It has the usual limits. One folder at a time means a big mailbox is a long job. Nested folders sometimes arrive flattened. A few messages may pick up the copy date instead of the original. And it only happens if Pegasus Mail launches on that old machine, which is never guaranteed. For a dozen folders it is a fair evening's work. For a full archive, the upload above is the better bet.
The question we get about Gmail is never about the upload, it is about what happened to the folders. Once people see their old Pegasus folders sitting in the label list, with the nested ones still nested, the worry goes away.
Pegasus Mail to Gmail: Which Route?
Two of these work, one does not. Here is how they line up.
| Question | Direct upload | IMAP copy from Pegasus | Gmail Import mail and contacts |
|---|---|---|---|
| How it works | Reads the Pegasus files, signs in, uploads | Pegasus copies each folder to imap.gmail.com | Pulls from another live account over POP |
| Reads PMM and CNM files | Yes | Yes, through Pegasus | No |
| Works if Pegasus will not start | Yes | No | No |
| Whole mailbox in one run | Yes | No, folder by folder | Not from files at all |
| Folders to labels | Kept, nested as Parent/Child | Usually kept, sometimes flattened | Not applicable |
| Time for a big archive | Set by upload speed | Hours of hands-on copying | Cannot be used |
| Cost | Free trial, then a licence | Free | Free |
Univik Pegasus Converter reads your PMM, CNM and PMI files, logs in to Gmail for you and turns each folder into a label, dates and attachments kept. It can also write PST, MBOX or EML files. Office 365 and any IMAP mailbox are outputs too.
Windows 7 to 11 · nothing goes anywhere but the Gmail account you choose · the trial uploads a taster from each folder
The short version
- Gmail's own import pulls from another live account and cannot read Pegasus PMM or CNM files.
- Direct upload: open the Pegasus user folder in Univik Pegasus Converter, choose Gmail, sign in, run.
- Each Pegasus folder becomes a label, nested ones as Parent/Child. Dates are kept.
- Free Gmail gives 15 GB shared with Drive and Photos, so check the mailbox size first.
- If Gmail rejects the password, make an app password, which needs 2-Step Verification on.
- The IMAP copy from inside Pegasus costs nothing but goes folder by folder and needs the program to launch.
Upload Pegasus Mail to Gmail, free trial
Pegasus Mail to Gmail Questions
About This GuidePrepared by Leena Taylor Paul for Univik, which has shipped Windows email and file tools since 2013. Google's help pages were the source for the storage figure, the Import mail and contacts behaviour and the app password rule, all read in September 2026. The Gmail output was tried on a real Pegasus setup that had IMAP and POP3 accounts configured. Last checked 22 September 2026. Stuck on a sign-in? Support is a click away below.
Sources: Google: sign in with app passwords · Univik: Gmail IMAP, SMTP and app password settings · Univik Pegasus Converter