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How to Convert OLM to MSG in Bulk? Manual & Fast Tools
RecoveryTools OLM to MSG Converter is a reliable software to directly convert all items from OLM (Mac Outlook archives) to Windows Outlook (.msg) format with 100% data retention in a secure offline way.
Quickly Convert OLM Files to MSG: In 5 Simple Steps
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- Download the RecoveryTools OLM Converter Tool.
- Select the OLM files or folder from your computer, pen-drive or other connected source.
- Select OLM data items to be converted to MSG from the preview tree using the checkbox.
- Choose MSG as the saving option from dropdown.
- Select the file naming option, saving destination and press “Convert”.
- Download the RecoveryTools OLM Converter Tool.
Why Is It Difficult to Convert OLM to MSG Format? Key Challenges
It can be complex to convert Mac Outlook OLM files to MSG as Outlook for Mac cannot export to MSG and Outlook for Windows cannot open OLM files – as OLM does not have MAPI properties. Hence there is no native solution to carry out the export. The limited support of OLM files with context to New Outlook for Mac and prone to corruption of OLM has added to complexity.
Thus a secure external application like RecoveryTools is a reliable way. However users can also carry out the conversion for free – using manual IMAP method – where data integrity concerns exist. This guide is updated for 2026 Outlook ecosystems and helps convert OLM files to MSG with step-by-step instructions.
How to Convert OLM to MSG Format Manually for Free?
Users can easily export their OLM files into MSG format manually by using any email client like Gmail. All the steps are given below in detail:
Step 1: Import Orphan OLM to Mac Outlook
Important Note: If you have already uploaded, then skip this step.
- Go to File >> Import tab in Mac Outlook.
- Select “Outlook for Mac archive file (.olm)” >> Next icon.
- Find your orphan OLM file from your system.
- Select the required data and hit the Continue icon.
- Choose the folder to import data and hit the Import icon.
Step 2: Configure Gmail in Mac Outlook
- Go to Preferences >> Accounts in Mac Outlook.
- Hit on the “+” >> Email option.
- Put the login details and hit the Add Account option.
- And your Outlook accounts will connect automatically.
Now drag and drop or move OLM to Gmail email address. And then follow the next step to convert OLM to MSG.
Step 3: Connect the Same Account in Windows Outlook
- Open your Outlook icon.
- Click on the File tab.
- Choose the Add Account option.
- Put the login details of your same Gmail account.
- Enter the POP/IMAP details.
- Lastly, hit the Finish icon.
Now your all emails of OLM file will appear in connected Windows Outlook through a Gmail account. Now you can drag and drop the emails on a desktop screen and it will make an MSG file.
However, these methods have some drawbacks and limitations to convert OLM to MSG, which are explained below in detail.
Critical Technical Risks & Limitations of IMAP to Convert OLM to MSG
- Users have to follow multiple steps, which makes this method more lengthy and time-consuming.
- Also, you have to repeat the same process again and again for each email and OLM file.
- Mac & Windows Outlook must be connected to the same machine with the subscribed account.
- High risk of data loss, while moving your OLM file.
Features of RecoveryTools OLM to MSG Converter: Benefits You Get
RecoveryTools OLM to MSG Converter is a Microsoft Marketplace approved utility for fast and automated conversion without any technical risk. Here are the key features that sets it apart from other online & desktop based converts:
1- Retains All Data & Maps MAPI Properties During OLM to MSG Conversion
| Data Type | What’s Preserved |
|---|---|
| Emails & Attachments | Email message body and attachments & inline images in original format (PDF, XLS, EML, JPEG etc.) HTML layout, embedded styling, embedded signatures, hyperlinks, original UTF-8/Unicode characters |
| Header | Full MIME/Transport headers, SMTP and IMAP addresses, From, To, Cc, Bcc, display names, Reply-To, timestamp accuracy, flags and Global Identifiers |
| Contacts | Full Name Structure, Organization & Job Title, Email Addresses (aliases), Phone Numbers & Addresses, Profile Photos & Notes |
| Calendars | Timestamps & Time Zones, Event Location & URLs, Organizer & Attendee List, Recurrence Rules, Free/Busy Status Flags |
| Tasks, Notes & Journals | Subject & Description Body, Due Dates & Timestamps, Execution Status, Urgency & Flags, Categorization & Logs |
2- Easy to Use Tool for All With Minimal Specifications
- Works on All Mac & Windows OS
- Light weight software – 38.1 MB and requires no advanced processor or Outlook installed
- Simple GUI and UX for direct conversion without any technical skills
3- Support Conversion of All Types of OLM Files to MSG
- OLM exported from Outlook for Mac 2024, 2019, 2016 or 2013 can be converted to Unicode MSG. The tool even supports OLM export from other third party Tools.
- Extracted Mode for orphaned & corrupt OLM files to MSG conversion – it deeply scans raw binary OLM data to extract recoverable items.
4- Securely Convert OLM Files to MSG Format
100% offline local conversion with read-only OLM access and zero cloud uploads, ensuring zero data alteration while maintaining full HIPAA, GDPR, and CAPA compliance.
5- File Naming Options for Easy Search in MSG Exports
10+ Custom naming conventions like date (DD-MM-YYYY) + from + subject, subject + date (DD-MM-YYYY), from + subject + date (DD-MM-YYYY), etc in the exact folder and subfolder structure after conversion.
6- Targeted Extraction of Items from OLM Files to MSG
Filter OLM emails, contacts and calendar to MSG based on filters like:
- Date Range: Start Date to End Date
- From & To: Certain sender and receiver
- Subject: Keywords eg: Tax, University, Ticket, Invoices
- Exclude Folders: Avoid unnecessary folders like Drafts, Junk or Deleted
- Mails, Calendars, Contacts, Notes (Item Type Filter)
Method Comparison: Free-Manual VS Tool Based Way to Save OLM Files to MSG
| Criteria | Manual IMAP Method | RecoveryTools OLM to MSG Converter |
|---|---|---|
| Conversion Speed | Slow (~100 emails/hour) | Fast (-10,000 items/minute) |
| Requires Outlook for Mac | Yes | No |
| Folder Structure Retention | No, Flattened | Reconstructed with exact folder and subfolder |
| Contacts/Calendars | No | Yes |
| Simultaneous Bulk Export | No | Yes |
| Corrupted OLM Handling | No | Yes |
Why Convert OLM to MSG Format? Real Cases & Needs
Whenever a user converts Mac Outlook OLM files to MSG format they are most likely struggling with OLM’s incompatibility and need selective output of not only emails but contacts & calendars from large OLM files with MAPI properties kept on each item as its own file.
- Access Certain Emails from OLM Archive in Outlook for Windows or Other Applications like CRM, Document Management Systems (DMS), Ticketing, ERP & Helpdesk Systems.
- eDiscovery & Legal Compliance: Individual MSG files are required & considered better by forensic investigators and legal teams.msg files for exhibit indexing, Bates stamping and regulatory auditing.
- Recovery and Future Corruption Prevention: OLM files are more susceptible to corruption than MSG, users either rely on built-in repair or via the tool for recovery and then saving in MSG format.
In case you need to convert OLM files to MSG for migrating from Outlook for Mac to Windows – it is better to convert OLM to PST as MSG may need some extra work & whole PST – lets you open the whole Mac mailbox in Outlook for Windows.
“I no longer have legacy Outlook for Mac anymore – but I have its archived data in OLM. I need to access some emails in my new Outlook installation on Windows and got a subscription free with my new laptop. How can I do so? Is MSG a good export option here” – Martha Jared, Texas
Differentiating OLM and MSG Files
Here is the table outlining differences between OLM and MSG files to understand the requirements to convert OLM to MSG in more better way:
| Characteristics | OLM | MSG |
|---|---|---|
| Compatibility | Mac OS | Windows OS |
| File extensions | .olm | .msg |
| Developed by | Microsoft | Microsoft |
| Associated Apps | Outlook for Mac | Outlook for Windows |
| File Structure | Database like structure contains multiple emails, attachments, contacts and calendar in a single file. | Single message file containing one email with attachment. |
| File Size | Larger due to multiple email elements | Smaller due to containing one email in a single file. |
| Purpose | To backup or archive entire mailboxes on Mac | Individual email file on Windows |
FAQs: Convert OLM Files to MSG Format
Q: Can Outlook for Mac export directly to MSG?
No, it is not possible to convert OLM to MSG using Outlook for Mac. You need to use a dedicated utility or use the IMAP relay method.
Q: Is there any limit on how many MSG files I can create from OLM?
No, using the tool you can bulk export items from OLM files to MSG. The tool can support multiple large OLMs (35-100GB) without any error and the number of exports is based on the size of each item.
Q: Can I convert OLM to MSG without Outlook installed?
Yes, using the tool does not require Outlook installation on Mac or Windows.
Q: Does converting OLM to MSG format preserve attachments?
Yes, the attachments are encoded in Compound File Binary Format (CFBF) in MSG and can be accessed by opening with Outlook application.
Q: How much time does it take for Mac Outlook OLM to MSG conversion?
It can take a couple of minutes to process the conversion. However, the exact time for OLM to MSG converter is based on your system specification, OLM file size, or whether you are converting a healthy or a corrupted OLM.
