Reviewed by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion. Shubham is an external reviewer and not a PCDOTS employee.
Table of Contents
Moving a company off MDaemon and onto Zimbra sounds simple until you face the actual mailboxes. Years of folders, thousands of messages and zero room for data loss. So how do you migrate MDaemon to Zimbra without breaking anything? Here’s the complete answer.
Summary
To migrate MDaemon to Zimbra, load your MDaemon files into PCDOTS Email Converter, click Export, choose IMAP Account and enter your Zimbra login. The software pushes complete mailboxes with folder structure intact. The manual route uses a desktop email client with both accounts connected, which works but moves one mailbox at a time.
Why migrate from MDaemon to Zimbra?
An MDaemon to Zimbra migration is the process of moving complete mailboxes, including folders, attachments and metadata, from an MDaemon mail server to a Zimbra Collaboration account. Both are solid platforms, so the move is usually about fit rather than failure.
Here are the reasons that show up most often in real migrations.
- Collaboration features. Zimbra bundles shared calendars, contacts, tasks and briefcase file sharing in one web interface. Teams that outgrow plain email tend to want this.
- Open source flexibility. Zimbra ships an open source edition, so organizations can run it on their own Linux servers without per mailbox licensing for the base product.
- Company changes. Mergers, new IT leadership or a hosting provider switch often force a platform decision. The mail data has to follow.
- Consolidation. Companies running MDaemon on Windows sometimes standardize their whole stack on Linux, and Zimbra fits that direction.
Whatever the trigger, the migration itself follows the same 3 stages. Find the data, move the data, verify the data.
Where does MDaemon keep your emails?
This part trips people up. MDaemon stores each message as an individual plain text file inside per user folders on the server, typically under the MDaemon\Users directory. Every mailbox is a folder tree full of message files rather than one big database.
That design is actually good news for migration. Because the messages sit in open readable files, a converter can read them directly from a copied folder. You don’t need the MDaemon server running, and you don’t need admin access to the live machine once you have a copy of the user directories.
So step zero of any MDaemon migration is simple. Copy the user folders you need to the machine where you’ll run the migration.
Can you move MDaemon to Zimbra manually?
Yes, and for one or two small mailboxes it’s a fair option. The standard manual route uses a desktop email client as a bridge.
- Install a desktop client like Thunderbird on any computer.
- Add the MDaemon account over IMAP, then add the Zimbra account over IMAP in the same client.
- Wait for both accounts to sync fully.
- Drag folders from the MDaemon account onto the Zimbra account.
- Let the client upload everything, then spot check the results in Zimbra webmail.
Now the honest part. This method needs both servers live and reachable at the same time. It moves one mailbox per setup, so 40 users means 40 rounds of account configuration. Large folders can stall mid transfer and the client won’t always tell you. And if the MDaemon server is already decommissioned, the IMAP route is closed entirely because there’s nothing to connect to.
For a single mailbox with both servers online, go manual. For anything bigger or for migrations from copied files, use the converter below.
“Server migrations fail quietly, not loudly. An IMAP transfer that drops connection mid folder leaves a mailbox that looks complete and is not. Compare folder counts on both ends before you decommission the source server. Every time.”
Shubham Dixit · Independent Expert, Email Forensics and Data File Conversion
How to migrate MDaemon to Zimbra with a converter?
The PCDOTS Email Converter reads MDaemon files directly and pushes them into your Zimbra account over IMAP in one run. It keeps the folder structure, handles multiple mailboxes in a batch and shows you a preview before anything moves. The same engine also powers the dedicated MDaemon Converter if you prefer a single purpose tool.
Runs on Windows 11, 10, 8.1 and earlier. Free demo converts 10 emails per folder.
The whole MDaemon to Zimbra migration takes 6 steps.
Step 1: Install and launch the software
Download the setup on your Windows computer, install it and open the application.
Step 1: The Email Converter home screen after launch.
Step 2: Load your MDaemon files
Click Open, go to Email Servers and choose MDaemon Files. Browse to the copied MDaemon user folders. The MDaemon server doesn’t need to be running.
Step 2: Choosing MDaemon Files from the Email Servers menu.
Step 3: Preview the loaded mailboxes
Every folder appears in the left panel with its messages. Click through and confirm the data looks right. Deselect any folders you don’t want to migrate. This preview is your first safety check.
Step 3: MDaemon folders loaded with full email preview.
Step 4: Choose IMAP Account as the export option
Click the Export menu and select IMAP Account. Zimbra speaks IMAP natively, so this is the direct route into your new mailboxes.
Step 4: Picking IMAP Account from the export menu.
Step 5: Enter your Zimbra account details
Type the Zimbra email address, password and your Zimbra server’s IMAP host. Use port 993 with SSL, which is the standard secure IMAP setting on Zimbra servers. Click Save and the transfer starts.
Step 5: Zimbra login details entered before the transfer.
Step 6: Confirm the data in Zimbra
When the process reports complete, log into Zimbra webmail. Your MDaemon folders sit there in the same structure they had on the old server.
Step 6: The migrated mailbox confirmed inside Zimbra.
Bonus before you export. The Extract button can pull attachments, email addresses and phone numbers out of the MDaemon data separately, which is handy for building contact lists during the move.
How do you verify the migration worked?
Don’t skip this. A migration isn’t done when the progress bar finishes. It’s done when the numbers match. Run this 4 point check for every mailbox before you retire the old server.
- Folder count. Same number of folders on both sides, including nested ones.
- Message count per folder. Compare the item counts folder by folder, not just the totals.
- Attachment spot check. Open 5 random messages with attachments in Zimbra and confirm the files open.
- Date integrity. Check that old messages kept their original dates instead of showing the migration date.
If you only want to inspect MDaemon style mailbox files before or after a move without converting anything, the free MBOX viewer opens mailbox files for reading at no cost. And if a future project ever runs the other way, the Zimbra Converter handles exports out of Zimbra.
Manual IMAP method vs Email Converter
Quick decision table. Pick based on mailbox count and whether the old server is still alive.
| What matters | Manual IMAP method | PCDOTS Email Converter |
|---|---|---|
| Needs MDaemon server running | Yes, both servers live | No, reads copied files |
| Multiple mailboxes in one run | No, one per setup | Yes, batch supported |
| Folder structure preserved | Usually, with manual care | Yes, automatic |
| Preview before transfer | No | Yes |
| Attachment and address extraction | No | Yes, built in |
| Cost | Free | Free demo, $99 full |
| Best for | 1 or 2 small mailboxes | Whole server migrations |
People also ask
How do I migrate MDaemon to Zimbra without losing folder structure?
Use the converter route. Load the MDaemon files, export to IMAP Account with your Zimbra credentials and the software recreates the full folder tree inside Zimbra automatically. The manual drag method can preserve structure too but you have to move folders carefully one branch at a time.
Where does MDaemon store its email files?
MDaemon keeps each message as an individual plain text file inside per user folders on the server, normally under the MDaemon\Users directory. Copy those user folders and you have everything a migration needs.
Do I need the MDaemon server running for the migration?
Not with the converter. It reads MDaemon files directly from a copied folder, so even a decommissioned server can be migrated from backup data. The manual IMAP method does need both servers live.
Can I migrate only emails from a specific date range?
Yes. The software includes filter options so you can limit the transfer by date range and other criteria before exporting to Zimbra.
How many emails can I migrate for free?
The free demo converts 10 emails per folder, which is enough to test the full MDaemon to Zimbra workflow on real data. The licensed edition removes the cap.
Does the converter work on Windows 11?
Yes. It runs on Windows 11, Windows 10, Windows 8.1 and earlier editions, plus Windows Server releases.
The short version
So an MDaemon to Zimbra migration comes down to one choice. If you have 1 or 2 mailboxes and both servers online, the manual IMAP bridge through a desktop client costs nothing but time. For everything else, PCDOTS Email Converter reads the MDaemon files directly, pushes complete mailboxes into Zimbra over IMAP and gives you previews and filters along the way. Either way, verify your folder counts before switching off the old server.
Test the free demo on one real mailbox and see the workflow yourself.
How many mailboxes are sitting on your MDaemon server right now?
