Free Online MBOX to PST Converter
MailsDaddy Online MBOX to PST Converter turns MBOX files from Thunderbird, Apple Mail and Google Takeout into an Outlook PST in your browser. It needs no Outlook or mail client and is free for files up to 200 MB. For larger files use Premium (up to 5 GB) or the desktop edition.
- No Outlook, Thunderbird or Apple Mail needed
- Works on Windows, macOS, Linux and Chromebook
- Free up to 200 MB per file
At a Glance Specifications
Key operational details, supported formats, system dependencies, and security limits.
MBOX in → Unicode PST out
Standard MBOX / MBX files containing email messages, headers, attachments and folders.
200 MB Free · Premium $39
Free for one file up to 200 MB per account. Premium converts files up to 5 GB for $39.
No Outlook or client needed
Runs in your browser on Windows, macOS, Linux and ChromeOS.
Thunderbird, Apple Mail, Google Takeout, Eudora, Postbox, Opera Mail and other clients
Supports healthy and damaged MBOX and MBX files.
TLS 1.3 · Auto-wiped in 2 hours
Files are deleted from servers after 2 hours. Download links expire after 24h (Free) / 48h (Premium).
Outlook 2013–2024 & M365
Standard Unicode PST ready to import or open directly in 32-bit and 64-bit Outlook.
When to Convert MBOX to PST Online
Resolve inaccessible MBOX data, recover damaged archives, and convert without Microsoft Outlook in minutes.
Thunderbird to Outlook Migration
Migrating from Mozilla Thunderbird to Microsoft Outlook? Convert your Thunderbird mail folders to Outlook PST with email headers.
Google Takeout MBOX to Outlook
Exported your Gmail or Google Workspace inbox via Google Takeout? Convert the bulky .mbox archive into a tidy Outlook PST file ready to open.
Apple Mail (.mbox) to Windows Outlook
Switching from macOS Apple Mail to a Windows PC? Convert Apple Mail exported mailboxes directly to Unicode PST without installing extra software.
Old Archives from Eudora or Opera Mail
These clients also store mail as MBOX or MBX files. Convert them to standard PST to open and read them in Outlook.
Why Convert MBOX to PST Without Outlook?
MBOX is a common mailbox format used by Mozilla Thunderbird, Apple Mail, Google Takeout, Eudora and Opera Mail. Microsoft Outlook does not provide native support to open or import .mbox or .mbx files directly. MailsDaddy Free Online MBOX to PST Converter allows you to convert MBOX to Outlook PST directly in your web browser without Microsoft Outlook, Mozilla Thunderbird, or complex IMAP configuration.
No Email Client Installation Required
Convert MBOX files directly in your web browser on Windows, macOS, Linux, or ChromeOS without installing Thunderbird or Outlook.
Direct Google Takeout Conversion
Easily convert Gmail exports from Google Takeout (.mbox) into clean PST files ready to open in Outlook.
Cross-Platform Compatibility
Move mailboxes between different operating systems and mail clients without configuring temporary IMAP sync servers.
How damaged MBOX files are handled
Large MBOX archives often become corrupted when email client processes terminate unexpectedly during downloading or compaction. Broken "From_" line delimiters, missing MIME boundaries, and encoding conflicts frequently prevent third-party tools from parsing emails properly. The converter tries to repair broken boundaries and extract the messages it can read.
Dynamic From_ Boundary Healing
Finds broken separators between messages so each message can be extracted on its own.
Headers and attachments
Keeps message headers, multipart attachments and UTF-8 text carried over.
Files up to 200 MB
Free conversion handles files up to 200 MB. Premium handles up to 5 GB; the desktop edition has no size limit.
Where to Find Your MBOX File
Step-by-step guidance on locating raw mailbox archives from common email clients.
Mozilla Thunderbird
In Thunderbird choose Help > Troubleshooting Information, then click Open Folder next to Profile Folder. Open the Mail folder (for POP accounts) or ImapMail folder (for IMAP accounts). Each mail folder is a file without an extension, for example Inbox. That file is your MBOX file. Do not upload the .msf files; they are only index caches.
Apple Mail (macOS)
Select the target mailbox in Apple Mail, choose Mailbox > Export Mailbox, and pick a destination folder. Apple Mail creates a .mbox package. Open or show package contents and upload the mbox file inside it.
Google Takeout (Gmail)
Go to takeout.google.com, deselect everything, select Mail, create the export and download the ZIP archive. Unzip it. Your Gmail labels will be exported as individual .mbox files ready for conversion.
How to convert MBOX to PST online
The whole conversion process is designed so you can complete it in minutes without installing software.
Upload your MBOX file
Select your .mbox file or drag it into the upload box. Files up to 200 MB are free.
Convert to PST
The converter reads the MBOX messages, headers and attachments and builds a Unicode PST.
Download the PST
Download the PST from the result screen. It stays available for 24 hours on the free plan and 48 hours with Premium.
How to Import Converted MBOX PST into Microsoft Outlook
Compatible with Microsoft Outlook 365, 2024, 2021, 2019, 2016, and 2013 on Windows.
Open Outlook on Windows
Start Microsoft Outlook (Microsoft 365, 2024, 2021, 2019, 2016, or 2013) on your computer.
Select Open Outlook Data File
In the top menu bar, click File > Open & Export > Open Outlook Data File (.pst).
Access Thunderbird & Gmail Folders
Browse and select the downloaded PST file. Your folders, emails, headers, and attachments will appear in the navigation pane.
What is converted
MBOX files store email only. Your folders, emails, attachments and headers are carried over into an Outlook PST.
Mail folder structure
All folders and subfolders (Inbox, Sent, Drafts, custom folders) are mirrored in the output PST file.
Emails & message attributes
Messages with sender, recipients, subject, date, headers, plain text or HTML body, and read/unread flags.
Attachments & inline images
Attachments and inline images stay with their original messages.
Start free. Upgrade when you need everything.
The free tier is enough to confirm your mailbox opens correctly before you commit.
- File size up to 200 MB
- Convert single file for Free
- Free account required, one file per account
- Free Conversion available for 24 hours to download
Premium
Secure Online Transaction via PayPro Global
- File Size limit is upto 5 GB
- Convert Single File at $29
- Converted file available for 48 hours to download
Personal Edition
Local desktop processing • No size limit. Batch conversion and local PC processing ($39). Licence for up to 2 PCs
- No file size limit
- Batch conversion of unlimited files at $39
- Licence for up to 2 PCs • Offline PC processing
- Converted File on system for unlimited period
Online MBOX Converter vs Desktop Edition
Compare the free online web app against desktop software and manual export.
| Feature | Online MBOX ConverterCurrent | Desktop Edition | Manual Method |
|---|---|---|---|
| Cost & Access | Free ($0) up to 200 MB Upgrade available for large files up to 5 GB | Lifetime License ($39) Licence for up to 2 PCs, unlimited usage | Free, needs Outlook or source client Needs a mail account or server |
| Software Needed | Zero Installation Runs in your browser (no Outlook) | Windows Desktop App Offline processing on your PC | Multiple Desktop Apps Requires Outlook + source client |
| Max Mailbox Size | 200 MB (Free) / 5 GB (Premium) Fast cloud conversion pipeline | No File Size Limit Tested on large archives | Depends on your email client May fail on large mailboxes |
| Batch Processing | Single File Pipeline Converts 1 file at a time | Simultaneous Batch Mode Batch conversion of multiple files | Manual Export / Sync Drag & drop folder by folder |
| Damaged Archives | Automated Cloud Repair Recovers readable items & headers | Advanced Deep Scan Offline processing on your PC | May fail on damaged files Clients abort on broken records |
| Operating System | Any OS (Browser-Based) Windows, macOS, Linux, ChromeOS | Windows Only Windows 11, 10, 8, 7 & Server | OS Restricted Limited to client OS support |
| Privacy & Retention | TLS 1.3 · Auto-Wiped in 2h PST link active 24h (Free) / 48h (Paid) | Completely Offline Processing Data never leaves your computer | Syncs to Mail Server Best for small, healthy mailboxes |
| Recommendation: | Convert Online Free | Get Desktop ($39) | High risk of corruption & Outlook crashes |
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Frequently Asked Questions
Clear, detailed answers about MBOX conversion, Outlook compatibility, and data privacy.
Get your mailbox back today.
Upload your MBOX file and download an Outlook PST in a few clicks.