Quick Steps: Convert OLM to PST (Fast Answer)
Convert OLM to PST by exporting your Outlook for Mac mailbox, syncing it to a Gmail IMAP account, then exporting a PST from classic Outlook on Windows. This manual route works for smaller mailboxes and active accounts. For large OLM files or no Outlook access, use a converter.
- Export your mailbox to OLM in Outlook for Mac (File > Export).
- Add Gmail IMAP in Outlook for Mac and move folders into Gmail.
- Set up the same Gmail account in classic Outlook on Windows.
- Let the mailbox fully sync (Download email for the past = All).
- Export to PST: File > Open & Export > Import/Export.
Fastest for large OLM/no Outlook: Use a converter, select the OLM file, and export to PST.
Free workaround: Use Gmail IMAP and export PST (mail only).
Requirements (manual method)
- Outlook for Mac to create the OLM export.
- Gmail account with IMAP enabled.
- Classic Outlook on Windows (not New Outlook) for PST export.
- Enough free disk space for the PST file.
- Save to a local folder (avoid OneDrive during export).
Best method by scenario:
- Small mailbox + Outlook on both Mac and Windows: Gmail IMAP method.
- No Windows Outlook or large mailbox: use a converter.
- Need offline/batch conversion: use a converter.
Best method by mailbox size
- Small (under 2 GB): IMAP workaround often finishes within a few hours.
- Medium (2-10 GB): IMAP may take overnight or 1-2 days; a converter is faster.
- Huge (over 10 GB): IMAP can take days and risk duplicates; use a converter or Microsoft 365 sync and export.
Before exporting: make sure all mail is downloaded
Make sure the mailbox finishes syncing in Windows Outlook before exporting. For Exchange/Office 365 accounts in Cached Exchange Mode, set Download email for the past to All, then wait for sync to complete so the PST includes everything.
Avoid exporting to OneDrive-synced folders
If the PST is stored in OneDrive, sync can show “file in use” or “processing changes” and slow or block access. Export to a local folder first, then move the PST after the export completes.
What Outlook export includes (and does not)
- Included (classic Outlook PST export): Mail with attachments, contacts, calendar items, tasks, and selected folders when those items exist in the account being exported.
- Not included: Rules, blocked/safe sender lists, view settings, folder permissions/properties, and autocomplete cache.
Microsoft notes PST export will not include folder properties/views, rules, or blocked senders lists.
IMAP workaround note: You are exporting a Gmail/IMAP mailbox, so the PST will contain emails, attachments, and folders/labels only. Mac contacts, calendar, and tasks are not included.
Export the account root with Include subfolders to capture Inbox, Calendar, Contacts, and Tasks when those items exist in the account.
What you will actually get in the PST
Microsoft 365 sync means adding the same account in Windows Outlook and exporting a PST if you need a file.
| Method | Mail + attachments | Folders/labels | Contacts/Calendar/Tasks |
|---|---|---|---|
| Gmail IMAP workaround | Yes | Yes (labels as folders) | No |
| Converter (direct OLM) | Yes | Yes | Yes (when present in OLM) |
| Microsoft 365 sync + export | Yes | Yes | Yes |
Privacy / compliance note
The IMAP workaround uploads mail to Gmail temporarily. If the mailbox is sensitive or regulated, prefer offline conversion or Microsoft 365 sync within your tenant. Save PST files locally first, then move them to managed storage.
What is an OLM file?
An OLM file is the archive/export format used by Outlook for Mac. It stores mail, calendar, contacts, tasks, and notes so you can back up or move data within Mac Outlook.
- Created via Outlook for Mac export.
- Mac-only format (Windows Outlook cannot open it).
Official Microsoft references:
- Create an Outlook Data File (.pst) to save your information
- Export emails, contacts, and calendar items to Outlook using a .pst file
- Export items to an archive file in Outlook for Mac (.olm)
Why Convert OLM to PST?
- Move from Outlook for Mac to Windows Outlook (OLM isn’t supported on Windows).
- Create a portable PST backup for archiving or migration.
- Consolidate multiple mailboxes into one Windows-friendly file.
- Use Windows Outlook features and compliance tooling.
Convert OLM to PST Without Outlook (Is it Possible?)
Manual method: no (you need Outlook on Windows to export PST). With a converter: yes, you can create a PST without Outlook. Outlook for Mac is only needed for the free IMAP workaround.
Classic Outlook vs New Outlook
- Classic Outlook: PST export uses File > Open & Export > Import/Export.
- New Outlook: PST export is under Settings > Files > Export, and PST support has limitations (for example, contacts and calendar items in PST are not available in new Outlook at this time).
- For OLM conversion: Use classic Outlook or a dedicated converter.
- Tip: If you are stuck in the new Outlook, look for the “New Outlook” toggle in the top right and turn it off to return to classic Outlook and access the export tools.
How to Convert OLM to PST?
Converting OLM files to PST format is essential for users looking to transition their email data from Mac Outlook to Windows Outlook, ensure their emails are accessible in a Windows environment, or create versatile backups of their Outlook Mac emails in PST format. There are primarily two approaches to achieve this: manually converting OLM to PST and using specialized OLM to PST conversion software. Below, we explore both methods to guide you through this important process.
Note: Before converting OLM to PST, always back up your Outlook for Mac data. This step is crucial to prevent potential data loss during conversion. You can back up by exporting your OLM file to a secure location on your computer or an external drive. Having this backup ensures you can restore your original data if needed.
Instant Solution - SysCurve OLM to PST Converter
Quickly convert OLM to PST, MBOX, EML, MSG, HTML, RTF, and other file formats.
Method 1: Free workaround: Move Mac Outlook mail to Windows Outlook and export PST (Gmail IMAP)
| Transfers (IMAP) | Doesn’t transfer |
|---|---|
| Email messages, folders/labels, and attachments. | Contacts, calendar, tasks, and notes (export separately). |
Important: This does not convert the OLM file directly. It migrates email messages and folders via Gmail IMAP. This method moves email messages and mail folders/labels. Contacts, calendar, and tasks don’t migrate via IMAP; they need separate export/import.
This method uses Gmail IMAP as a bridge between Outlook for Mac and Outlook on Windows. To proceed, you need a Gmail account and Outlook on both Mac and Windows. It’s best for smaller mailboxes and active accounts.
Privacy note: This method uploads mail to Gmail temporarily. See the Privacy / compliance note.
Large mailbox note: IMAP sync can take hours or days for big mailboxes, and Gmail label behavior can create duplicates.
Step 1: Enable IMAP in Gmail
- Sign in to your Gmail account through a web browser.
- Click the gear icon in the upper right corner and select See all settings.
- Go to the Forwarding and POP/IMAP tab.
- In the IMAP access section, select Enable IMAP.
- Click Save Changes at the bottom.
Step 2: Generate an App Password
- Visit myaccount.google.com.
- Under Security, enable two-step verification if it’s not already activated.
- Then, find and select the App passwords option under Security.
- Enter Outlook MAC & Windows as the app name and click Create.
- Copy the App password and click Done.
Note: App Passwords require 2-Step Verification. If you don’t see App Passwords, your account type or security settings may block it.
Step 3: Configure Gmail in Outlook Mac
- Open Microsoft Outlook on your Mac.
- Navigate to Outlook > Preferences > Accounts.
- Click the + sign at the bottom of the screen and select Email.
- Enter your full Gmail address and the App Password you previously generated.
- Make sure IMAP is selected as the Type. Outlook should automatically fill in the server details for incoming (imap.gmail.com) and outgoing servers (smtp.gmail.com).
- Click Add Account.
Step 4: Import OLM to Gmail
- In Outlook for Mac, locate your Gmail account in the sidebar.
- Right-click (or Control-click) on your Gmail account or on an existing folder under your Gmail account where you want to create the new folder.
- From the context menu, select New Folder.
- Name your new folder by typing in the desired name when prompted, then press Enter or click away to finalize the creation of the folder.
- Locate the emails in Outlook you wish to move to Gmail. To select all use Command + A.
- Hold the Command key and drag the selected emails, then drop them into the new folder you created in your Gmail account.
- After that, the emails will import into your Gmail account. Verify that the emails have been moved to the correct folder/label.
Step 5: Configure Gmail in Windows Outlook
- Open MS Outlook and click the File option.
- Click the Account Settings > Account Settings.
- Enter your name and Gmail email address.
- Enter your App password and re-enter your App password.
- Click the Next button to start the verification process.
- Once the validation process is complete, click on the Finish button.
Before you export:
- Make sure all mail is fully synced in Windows Outlook (Download email for the past = All).
- Export to a local folder (avoid OneDrive-synced locations during export).
Step 6: Export PST using Outlook
- Within Windows Outlook, go to File > Open & Export > Import/Export.
- Select Export to a file and click the Next button.
- Select Outlook Data File (.pst) and click the Next button.
- Select the Gmail folder where you imported your Mac Outlook emails.
- Ensure Include Subfolders is checked and click on the Next button.
- Click the Browse button, provide a path to save the PST file, and click the OK button.
- Select Do not export duplicate items and click the Finish button.
See: Classic Outlook vs New Outlook for PST export differences.
By following these steps, you effectively convert OLM to PST using Gmail as an intermediary, enabling you to transfer Outlook Mac emails to Windows without the need for specialized OLM to PST software. This method not only facilitates the moving from Mac to Windows Outlook but also serves as a method to backup Outlook Mac emails in PST format, ensuring your data remains accessible and secure.
Move Contacts/Calendar to Windows Outlook
Option A (Exchange/Microsoft 365): Add the same account in Windows Outlook and let contacts/calendar sync automatically. No manual export is needed.
Option B (local-only / POP / On My Computer): Export and import separately.
- Contacts: Export to CSV (or vCard if available) from Outlook for Mac, then import in Windows Outlook.
- Calendar: Export to ICS/iCal from Outlook for Mac, then import in Windows Outlook.
Note: In new Outlook, contacts and calendar items stored in PST are not available at this time, so use classic Outlook for the import.
Official Microsoft guidance:Export items to an archive file in Outlook for Mac (.olm) | Import and export email, contacts, and calendar in Outlook for Mac
Troubleshooting the Gmail IMAP method
- Missing folders after sync: Make sure Include subfolders is checked and wait for full sync before exporting.
- Gmail labels vs folders: Gmail labels show up as folders in Outlook; nested labels appear as subfolders.
- Duplicates in PST: Choose Do not export duplicate items. Duplicates can also happen if the same email lives under multiple labels.
- Large mailbox: This workaround can be slow for big mailboxes. Use a converter for large or time-sensitive migrations.
- App Password not showing: 2-Step Verification is required, and some Workspace/Advanced Protection policies can block App Passwords.
Method 2: Convert OLM to PST using OLM to PST Converter
For those who find the manual approach to be overly complicated or too time-consuming, leveraging a dedicated OLM converter tool presents a more streamlined and efficient alternative. Tools like SysCurve OLM to PST Converter are specially designed to simplify the OLM to PST conversion process, offering a direct path to convert OLM files into PST format. Besides PST, these tools often support converting OLM files into other formats such as MBOX, EML, MSG, HTML, and RTF, providing flexibility depending on your needs.
- Download and install the SysCurve OLM to PST Software.
- Open the OLM Converter tool and click the Browse button.
- Locate and select your OLM file and click OK to upload the file for conversion.
- Once the loading process is complete, you can view OLM file data.
- Click the Export option and choose the specific folders you wish to convert from OLM to PST.
- Select PST as an export option and specify a destination path where you want the new PST file to be saved.
- Click the Export button to start the OLM to PST conversion.
- Once the conversion is complete, click the Finish button. Your PST file is now ready for import into Microsoft Outlook on Windows.
Note: Before you can use the SysCurve tool for OLM to PST conversion, it’s necessary to transfer the OLM file from your Mac computer to the Windows system where the conversion tool is installed. This transfer can be accomplished by copying the OLM file onto an external storage device, such as a USB drive or an external hard drive, and then moving it to your Windows PC. It’s essential to ensure that the OLM file is completely and safely copied over before starting the conversion to avoid any data loss.
Using an OLM to PST converter tool like SysCurve simplifies the process of moving from Mac to Windows Outlook, effectively allowing you to transfer Outlook Mac emails to Windows. This method is not only more straightforward but also provides a reliable way to backup Outlook Mac emails in PST format, ensuring that your data remains accessible and secure on your new platform.
Other Helpful Features
- Convert OLM to PST, MBOX, EML, and MSG.
- Preview mailbox items before export.
- Export selected folders or date ranges.
- Preserve folder structure and email metadata (subject, dates, attachments).
- Compatible with Windows and common Outlook versions.
Frequently Asked Questions
Can I convert OLM to PST manually?
Yes. The Gmail IMAP method works for smaller mailboxes when you have Outlook on both Mac and Windows.
Do I need Outlook on Windows to create a PST?
Yes. Manual export requires Outlook on Windows. Without it, use a dedicated converter.
Does the IMAP workaround include contacts and calendar?
No. IMAP transfers mail only. Export contacts and calendar separately from Outlook for Mac.
Will the converter change my original OLM file?
No. It creates a new PST file and leaves the original OLM unchanged.
Can I convert large OLM files?
Large mailboxes can be slow via IMAP. A converter is faster and more reliable.
Is there a demo version?
Yes. The demo lets you preview data and export a limited number of items per folder.
The Final Word
Use the Gmail IMAP workaround for small, active mailboxes when you have Outlook on both Mac and Windows. For large or offline OLM files, a dedicated converter is the faster and more reliable path.
