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Written By Khushboo Maurya
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Updated on October 13th, 2026
Convert Opera Mail to Outlook: Easy Guide for Non-Tech Users
Fact-checked and reviewed in accordance with our
Editorial Policy
If you still have years of messages sitting in Opera Mail, you’ve probably noticed it feels stuck in the past. Opera Mail is no longer where the company puts its energy, while Outlook keeps getting updates, search improvements, and calendar and Microsoft 365 integration. Many people want to switch from Opera Mail to Outlook and are worried about losing old emails along the way.
This guide explains how Opera stores your mail, why the move isn’t a simple copy-paste, and how to convert Opera Mail to Outlook by creating a PST file that you can import into Outlook using Microsoft’s official steps.
Why Opera Mail Can’t Just Be Opened in Outlook
Outlook keeps its data in PST files, while Opera Mail keeps messages in mbox-style files. This is the root of the problem. Opera’s own community explains that the mail store holds messages in per-account folders, sorted by date, with each file being an mbox file that carries an .mbs extension. Each account’s messages sit in an accountN folder, and the .mbs files are mbox files with a different extension.
Outlook has no built-in way to read that format. A direct “File > Open” on an .mbs file will not work, so the data has to be converted first. That’s what people mean by Opera Mail to Outlook PST conversion.
Step One: Find or Export Your Opera Mail Data
You have two ways to get your messages ready.
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Option A:
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Option B:
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One real limitation of Option A: exporting folder by folder does not carry over your subfolder layout. One user noted that the procedure doesn’t maintain the sub-folder structure, so someone with four levels of folders would need to export each one individually. If you have a deep folder tree, this is the main reason to consider a dedicated tool later.
Tips Before You Start When You Convert Opera Mail to Outlook
- Back up first: Copy your Opera mail folder before you touch anything. Opera’s own forum users warn that messages no longer on the server are gone if you lose the local store.
- Check message counts: Note how many emails each folder has, then compare after import.
- Don’t forget contacts: Opera contacts are exported separately through the settings menu under import and export. Convert them to CSV, which Outlook can import.
- Test with one folder: Convert a small folder first so you know what to expect.
- Keep the original files until you are sure everything arrived.
Method 01: Manual Way to Switch from Opera Mail to Outlook (Free, but Slow)
If you have a modest mailbox and some patience, the free workaround goes like this:
- Export your Opera Mail folders as mbox files, as described above.
- Install Mozilla Thunderbird and add an import add-on such as ImportExportTools NG. The add-on is the tool recommended for bringing .mbs files into Thunderbird.
- Import the files into Thunderbird’s Local Folders.
- Set up a Gmail account in Thunderbird using IMAP and drag your folders into it.
- Add the same Gmail account to Outlook, then use Outlook’s Import/Export to save everything as a PST file.
This is the chain of steps people typically describe: configure a Gmail IMAP account in Thunderbird, move the MBOX emails into it, open that account in Outlook, and finally export to a PST with Outlook’s Import/Export feature.
It works, but it needs three applications, an online account, and a lot of waiting. The same source points out the downsides: risk of data loss, formatting problems, and it isn’t practical for large MBOX files or many accounts. For a few hundred emails, fine. Convert Opera Mail to Outlook PST for a business mailbox, think twice.
Method 02: Professional Way to Convert Opera Mail to Outlook
If you want something different for bulk conversion, a converter that reads mbox files and writes PST directly removes most of the trouble. You don’t need Thunderbird, a Gmail account, or any intermediate step.
Because Opera Mail data is mbox-based, a professional MBOX converter handles it. Cigati MBOX Converter is one such option, and it explicitly lists Opera Mail among supported sources. It works with MBOX files produced by Google Takeout, Thunderbird, Apple Mail, Eudora, Entourage, SeaMonkey, Opera Mail, and other MBOX-compatible applications.
- It convert MBOX to PST, EML, MSG, PDF, CSV, MBOX, and Thunderbird formats, & can export to Microsoft 365, Gmail, Google Workspace, Outlook.com, IMAP, and GoDaddy.
- Date-range filtering, duplicate detection, PST segmentation, MBOX split and merge options, & preservation of the email client’s folder hierarchy.
- Several MBOX files can be processed in one operation, and the tool is meant for individuals, IT admins, & migration specialists.
- Outlook is not required for conversion, plus a preview. It migrate Opera Mail to Outlook directly without needing Outlook, and lets users preview emails and split large PST files.
To know the conversion process, look at the step-by-step guide of Cigati MBOX Converter Tool, which helps to move Opera Mail data to Outlook.
Final Thoughts
Convert Opera Mail to Outlook is mostly a formatting problem. Your emails are intact on your drive, but in a format Outlook can’t read. The free manual method works for small mailboxes if you’re patient. For large mailboxes, deep folder trees, or business data, a dedicated converter saves time and lowers the risk of missing messages. Whichever way you go, back up first and verify the results.
Frequently Asked Questions
Q1. What is the best way to move Opera Mail emails to Outlook while retaining their original folder structure and metadata?
Ans. Folder-by-folder manual export tends to flatten your structure, so the best way is to convert the full mail store with a tool that keeps the hierarchy and message properties. Look for one that reads the whole mbox set at once and writes straight to PST, with the original sender, date, and header details intact. Whichever method you use, spot-check a few messages afterward.
Q2. What Opera Mail data can be exported to an Outlook-compatible format without losing attachments, headers, or message properties?
Ans. Your email messages are the main item, since they sit in mbox files and carry attachments inside them. A solid converter preserves attachments, headers, and formatting during conversion. Contacts need a separate CSV export, and settings and rules do not transfer, so you will rebuild those in Outlook.
Q3. Is it possible to transfer a large Opera Mail mailbox to Outlook with thousands of emails across different folders?
Ans. Yes. The manual Thunderbird-and-Gmail route is not suitable at that size, but a Cigati MBOX Converter can do this. Features like PST splitting help here, because very large single PST files can become slow and fragile. Convert in batches and verify folder counts as you go.
Q4. Can I migrate Opera Mail to Outlook easily without any technical skills?
Ans. Yes, if you use a guided converter rather than the manual route. The process is essentially: add your files, choose PST, click convert, then import the PST into Outlook. You don’t need to understand how mbox files work. You only need to know where you saved your files.
About The Author:
Khushboo Maurya is a digital content and SEO professional focused on creating useful, search-friendly content that connects with the right audience. She specializes in content optimization, website growth, and practical SEO strategies that improve visibility, engagement, and organic reach.
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