Corbett
Corbett OLM Converter opens Mac Outlook OLM files on Windows and saves mail as PST, EML, MBOX, PDF, HTML, TXT or CSV, with contacts as vCard and calendars as ICS. Folders, dates and attachments stay in place and no Mac is needed. Try free demo first.
Download free demo Purchase now
Works offline on your PC. Corbett never sees your OLM file or messages.
Free demo, scanned clean on VirusTotal and a 30 day refund window.
Lifetime licence from $99 Demo converts 10 emails per folder
Conversion scope
OLM file is the archive Outlook for Mac exports and few Windows programs open it. OLM software opens that archive on a Windows PC and saves emails, contacts and calendars in formats any system accepts, with your OLM left as it was.
Kept in output
6OLM input types
4Outputs
8Not needed
4OLM archive is the only export Outlook for Mac offers
Microsoft guide to exporting Outlook for Mac items to an archive file says an .olm archive is the only export option and that support for legacy Outlook for Mac ends in October 2026. Mail left in OLM files needs a way out. OLM converter opens the archive on Windows and saves it in a format you can use.
Related pages include PST Converter, MBOX Converter, MSG Converter and OST Converter. Other mail files sit on email converter tool page.
Core features
Five screens of Corbett software, in conversion order.
Source files
Select Open, then Email Data Files and choose Outlook for Mac OLM Files. OLM converter brings your archive into its panel and no Mac or Outlook is needed.
Spare Windows PC with no Outlook still works. OLM file converter opens your file and leaves it as it was.
Batch loading
Select a single OLM file or choose a folder to load several OLM files in one step.
Loaded files appear in one tree so OLM converter handles many OLM files, large ones included, in a single session. No file size limit applies.
Message preview
Click any message and a reading pane opens beside five analysis views. Admins and investigators use them to confirm correct folders before an export starts.
Content shows the email body. Message header lists From, To, Subject and Date. Properties reports message data, while hex and raw message views show stored values and code.
Output formats
Email files export to PST, EML or MBOX. Document files export to PDF, HTML, TXT or CSV, with contacts going to vCard and calendars to ICS. Export menu lists Gmail, Office 365, IMAP and Thunderbird for sending mail into an account.
Search by keyword first, then save only matched items. Quick search highlights hits in yellow and Advance search checks every field or only name, subject, To, Cc and content.
Export options
Switch on open folder after export, leave out greyed out folders, create empty folders and include email headers. For PST output, create an individual PST file for every folder so small files stay healthy.
Select Browse to choose a destination, then Save. Live progress shows every folder as it converts. Need Outlook files? Open OLM to PST Converter.
Working process
Four steps take an OLM file to its new format. Try them on one file in free demo first.
Open your OLM file
Start OLM utility on Windows, select Open, then Email Data Files and choose Outlook for Mac OLM Files. Select a file or choose a folder to load many.
Preview and select folders
Your OLM appears as one folder tree. Click any email to preview it, tick folders and search by keyword to trim your conversion.
Choose your output
Select Export and choose a format from PST, EML or MBOX for email files, PDF, HTML, TXT or CSV for documents.
Save your converted mail
Set options, select Browse for a folder and press Save. Live progress shows every folder and Open Folder takes you to your output.
Want screenshots for every click? Follow OLM converter guide.
Working process
Prefer text? Open Import OLM to Gmail accounts to follow a cloud upload from start to finish.
Extra options
Small options that save hours when you convert OLM files in bulk with OLM converter.
Batch OLM conversion
Many OLM files converted in one session
No file size limit
Large OLM files convert too
Folder hierarchy kept
Inbox, Sent and subfolders stay in order
Attachment extraction
Save attachments alone from any OLM
Email address extraction
Export addresses to CSV
Phone number extraction
Pull numbers from message bodies
File naming options
Name output by From, To, Date or Subject
Smart filters
Date, sender, subject and size
Quick and advance search
Find emails before you convert
Five preview views
Content, header, properties, hex and raw message
Individual PST per folder
One PST file for every folder
Log and CSV report
See what converted and what failed
USB and NAS targets
Save output to external drives and network storage
Include email headers
Keep full header data in output
Contacts and calendars
Contacts export to vCard and calendars to ICS
Choose output
Corbett saves to nine file formats. Match format to where your converted mail will open.
| Format | Best for | Opens in |
|---|---|---|
| PST | One file per mailbox with folders preserved | Microsoft Outlook |
| MBOX | Moving mail to a free email client | Thunderbird and Apple Mail |
| EML | One file per email, quick to search | Windows Mail and most email clients |
| Legal files, audits and printing | Any PDF viewer | |
| HTML | Reading mail with no email client | Any web browser |
| TXT | Plain text archives | Any text editor |
| CSV | Lists of senders, dates and subjects | Excel and Google Sheets |
| vCard | Contacts moved into a phone or address book | Outlook, Gmail and phones |
| ICS | Calendar entries shared between apps | Outlook, Google Calendar and Apple Calendar |
Free demo
Test OLM Converter on a Real OLM
Install free demo, open an OLM file, select a folder and choose a format. Free demo converts 10 emails per folder so your output is quick to check.
Download free demoTry before you buy
Free demo of OLM converter opens, previews and searches your full OLM. Only conversion is capped.
| Feature | Free demo | Full version |
|---|---|---|
| Open OLM and load folders | Yes | Yes |
| Preview, search and analysis views | All available | All available |
| Emails converted per folder | 10 | Unlimited |
| OLM size and file count | Conversion stops at 10 per folder | No limit |
| Price | Free | From $99 one time |
Use cases
Anyone who must convert an OLM file that will not open where needed.
Mac to Windows switchers
OLM converter saves a Mac mailbox as PST and retains folders in place for Outlook on Windows.
Users leaving legacy Outlook for Mac
Convert old OLM archives with OLM conversion software before support ends and open your mail in a format you control.
Legal and compliance teams
Convert OLM emails to PDF with OLM converter and name sender, date and attachments named clearly for case files and audits.
IT admins after a switch
Corbett saves leftover OLM files from retired Macs in formats users open without the old client.
Investigators
Preview message header, hex and raw views for an OLM of unknown origin before you export.
Marketers and list builders
Export addresses and phone numbers from an old OLM to CSV for outreach.
Why Corbett
No subscription
Lifetime price from $99
Works offline
No login and no upload
Original stays safe
OLM opens in view mode
No Mac needed
Convert OLM on a Windows PC
No size limit
Any OLM size and file count
Folders kept
Hierarchy stays in order
Smart filters
Date, sender, subject and size
30 day refund
Refund window after purchase
Before conversion
OLM converter converts a Mac Outlook archive into another format. Here is what that includes and where it stops.
| Capability | Supported | What it means |
|---|---|---|
| File to file conversion | Yes | OLM to PST, EML, MBOX, PDF, HTML, TXT and CSV with folders kept |
| Contacts and calendars | Yes | Contacts convert to vCard and calendars to ICS |
| Mac or Outlook installed | Not needed | Files open on a Windows PC with no Outlook |
| Source OLM | View mode only | Output goes to a new folder and your original stays as it was |
| Internet and passwords | Not needed | Conversion works offline on local files |
| Client settings and rules | Not converted | Account passwords, filter rules and saved searches stay behind |
| Live mailboxes | Other mode | Use Email Backup Software or Email Migration Tool for accounts |
| Mac and Linux | No | OLM converter installs on Windows only |
Outlook or tool
Microsoft guide to exporting Outlook for Mac items to an archive file says an .olm archive is the only export option. Here is where that route stops.
| Task | Outlook for Mac export | OLM software |
|---|---|---|
| Cost | Free | From $99 one time |
| Handful of items | Export from your Mac | Works too |
| Export formats | OLM archive only | PST, EML, MBOX, PDF, HTML, TXT and CSV |
| Open mail on Windows | Needs the archive converted | Opens OLM on Windows directly |
| Many OLM files | One export at a time | One batch of files or folders |
| Filters | Basic search only | Date, time, To, From, size and name |
| PDF file names | Typed in by hand | Named by From, To, Date or Subject |
| Machine without a Mac | Cannot open your file | Opens files by itself |
Outlook for Mac export is enough for a handful of items you keep on a Mac.
Global recognition
Users rate Corbett OLM converter 4.6 out of 5 from 683 reviews and these software directories list it.
CNET
Download.io
UpdateStar
TopSoftware Advisor
SaaSHub
Uptodown
Specifications
Download details
System
Supported editions
Windows 11 (64 bit), 10, 8 and 7 in 32 bit or 64 bit, plus Windows Server 2016, 2012 R2 and 2008.
Start Corbett with administrator rights.
Corbett has built Windows email utilities since 2020. Setup trouble and first use questions go to our support desk.
User testimonials
OLM converter shares 683 reviews on software index sites and customer feedback.
Collected across 683 reviews from software indexes and customer feedback. Three reviews below are unedited.
I have been searching for the reliable tool which can convert OLM files to multiple formats. Fortunately, I came across the Corbett OLM converter tool which is undoubtedly wonderful with excellent features. It allows to convert the OLM files into multiple formats without any hassles. I am happy with this tool.
I have used many Mac OLM converter tools but so far it has not given the desired results. The main problem was data integrity. However, this Corbett solution is the best because of the simplified GUI and active customer support.
It is quite a reliable solution, Corbett OLM converter helped me to export selected data from Mac OLM to document format. This software provides multiple data filters to classify data for selective conversion.
Before conversion
Three short checks keep your OLM conversion clean.
Export the archive from your Mac
Microsoft guide to exporting Outlook for Mac items to an archive file explains the export. Save your mail as an .olm archive on your Mac, then copy the file to your Windows PC.
Keep OLM files in one folder
Collect your archives into a single directory so one load brings them all into OLM converter.
Check free disk space
PDF and EML output can take more room than your OLM. Select an output drive with plenty of space.
Pulling out single items is covered in Extract attachments from OLM files and Extract email addresses from OLM file.
Best practice
Your OLM conversion only helps if your mail arrives in full. Four habits keep your data safe through it.
Backup first
Copy your original OLM before you start. Keep 3 copies on 2 types of media with 1 copy off site.
Start with a small OLM
Convert one small file with OLM utility and open a few messages in your new format. Catch a wrong setting before a large job.
Check the count
Compare folder counts in your Mac mailbox with the converted folders before you close the job.
Keep originals until checked
Store your source OLM files until counts match. Delete them only after you open converted mail.
Common questions
Steps, formats, limits and licence answers for OLM conversion.
Corbett opens a Mac Outlook OLM archive and saves its emails, contacts and calendars in another format. Corbett OLM Converter does that offline on Windows so OLM file converter needs no Mac.
Open OLM converter on Windows, select Open, then Email Data Files and Outlook for Mac OLM Files. Select a file or choose a folder, preview your mail, select Export, choose a format and press Save. Attachments stay with every message.
Microsoft guide to exporting Outlook for Mac items to an archive file says an .olm archive is the only export option in legacy Outlook for Mac. It holds your email messages, contacts and other items in one file.
Yes. OLM conversion software opens your archive by itself on Windows. No Mac, Outlook, internet connection or mailbox password is needed.
PST, EML and MBOX for email files, plus PDF, HTML, TXT and CSV for documents, vCard for contacts and ICS for calendars. Export menu lists Gmail, Office 365, IMAP and Thunderbird for sending mail into an account.
Select PST in the Export menu, set options like an individual PST for every folder and press Save. OLM to PST Converter shows every click and Import PST to Outlook handles the Outlook side.
Select PDF in the Export menu, search for the emails you need, choose a naming option and press Save. Every message becomes a PDF. OLM to PDF Converter handles that job and Save Outlook email as PDF shows another route.
Yes. Select MBOX for Thunderbird and Apple Mail, with folders kept in order. Open OLM to MBOX Converter for that job.
Yes. OLM converter saves contacts as vCard or CSV and calendars as ICS. Convert OLM to CSV files and Export Outlook emails to CSV show the steps.
Yes. Corbett opens a folder of OLM files and converts them all in one session.
No. OLM converter sets no size cap and large OLM files convert too. Keep free disk space for your output.
Yes. Search by keyword with quick search or use Advance search across every field or only name, subject, To, Cc and content, then save matched items.
Yes. Reading pane opens beside content, message header, properties, hex and raw message views for every email.
Yes. OLM converter retains folder hierarchy in order so Inbox, Sent and subfolders arrive as they were.
No. OLM software opens your file in view mode and output goes to a new folder. Keep a spare copy anyway.
Yes. Save attachments alone, export addresses to CSV and pull phone numbers from message bodies. Extract attachments from OLM files and Extract email addresses from OLM file show the steps.
Export menu lists Gmail, Office 365, IMAP and Thunderbird. Open Import OLM to Gmail accounts for the steps.
No. Conversion happens on your PC with no upload. Corbett never sees your OLM or messages.
No. Corbett installs on Windows only. Copy your OLM file to a Windows PC and convert it there.
Free demo of OLM converter opens your archive, shows every folder and gives you every search and preview. Conversion stops at 10 messages per folder, enough to test your output before you buy.
Windows 11 (64 bit), 10, 8 and 7, plus Windows Server 2016, 2012 R2 and 2008. There is no macOS or Linux build.
Personal licence works on 5 machines for $99, Business handles 25 for $299 and Enterprise works on 100 for $499. All three are one time payments with lifetime validity, 24/7 support and a 30 day refund.
OLM guides
Every page below handles one OLM job and answers questions it raises.
Other mail files sit on email converter tool page. Account moves use Email Migration Tool or IMAP Migration Tool, broken archives belong with email recovery software and email viewer software opens mail files free. Save a live account with Office 365 Backup Tool, Outlook.com Backup Tool or Gmail Backup Tool.
Get started
Test OLM Converter on a spare OLM copy first. Full access is from $99 in a single payment and refunds are open for 30 days.
Download free demo Purchase now
87.4 MB · Windows 11 to 7 and Windows Server 2025 to 2008 · 30 day money back