How to Export / Convert Outlook OLM Calendar to ICS (*.iCal) Format ?
You can convert OLM calendar files to ICS format using Turgs OLM Converter Wizard on Windows. The tool exports all calendar events, appointments, and recurring entries from Mac Outlook OLM files into standard ICS files you can import into Google Calendar, Apple Calendar, or any iCalendar-compatible app.
OLM is the file format used by Outlook for Mac to store emails, contacts, and calendar data. When you need to move your calendar events to a different platform, ICS (iCalendar) is the universal format that works everywhere.
Converting OLM calendar data to ICS lets you import your appointments into Google Calendar, Apple Calendar, Thunderbird, or any other calendar app. You don’t need Mac Outlook to do it.
Why Convert OLM to ICS?
ICS is the standard format for calendar data. Every major calendar platform supports it. Here are the most common reasons people convert OLM calendar files to ICS:
- Moving from Mac Outlook to Google Calendar or Apple Calendar
- Switching from a Mac to a Windows computer
- Sharing calendar events with colleagues who use different apps
- Backing up calendar data in a portable, open format
- Migrating calendar data to a new organization’s calendar system
ICS files are plain text files that follow the RFC 5545 standard. They store event titles, dates, times, locations, descriptions and recurrence rules. An ICS file exported from OLM will carry all of that information into whichever app you import it into.
One thing to know: OLM files can hold multiple data types including email, contacts and calendar data all in one file. When converting to ICS, only the calendar entries are relevant. Turgs OLM Converter Wizard handles this automatically.
What You Need
You need Turgs OLM Converter Wizard running on a Windows machine. The tool reads OLM files and converts the calendar data to ICS format. No Mac Outlook license is needed, and no Mac is required.
If you don’t already have your OLM file, export it from Outlook for Mac first: go to File > Export in Outlook for Mac, choose Outlook for Mac Data File (.olm), and save it. Then transfer the OLM file to your Windows machine and run the conversion there.
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How to Convert OLM to ICS
The conversion takes 4 steps and completes in minutes even for large OLM files with thousands of calendar entries.
Step 1: Launch Turgs OLM Converter Wizard
Install and open the application. The main screen shows a file selection panel where you add your OLM file.
Step 2: Add Your OLM File
Click Browse and navigate to your OLM file. The tool loads it and displays the contents including the calendar folders inside. You can see exactly which calendar folders are present before you start.
Step 3: Select ICS as the Output Format
In the conversion options, choose ICS as your output format. You can also set a destination folder for the output files. One ICS file is typically created per calendar folder in the OLM file.
Step 4: Convert and Import
Click Convert. The tool processes the OLM file and creates the ICS files in your destination folder. Once done, import the ICS files into your target calendar app using its built-in import function.
In Google Calendar: go to Settings > Import and upload the ICS file. In Apple Calendar: go to File > Import. In Outlook for Windows: go to File > Open and Export > Import/Export and choose iCalendar.
Key Features of Turgs OLM Converter Wizard
The tool covers more than just OLM to ICS conversion. Here is what makes it a solid choice for OLM data migration:
- Calendar data preserved: Events, appointments, recurring entries, reminders and locations all carry over
- Batch processing: Convert multiple OLM files in one operation
- Multiple output formats: ICS, PST, MSG, EML, MBOX, PDF, HTML and more
- No Mac Outlook required: Runs standalone on any Windows 7 or later machine
- Preview before convert: Browse calendar entries inside the OLM file before starting
- Date filter: Select a specific date range to export only the events you need
The date filter is particularly useful when you want to export only recent events rather than your entire calendar history. For example, you can export only events from the last 2 years instead of a 10-year archive.
Limitations to Know
Limitations
- Windows only. The tool runs on Windows 7 through Windows 11. No Mac version is available.
- Attachments within calendar events are not carried over to ICS format. ICS does not support embedded attachments.
- The free trial processes a limited number of items. The full version removes this restriction.
- Very large OLM files with tens of thousands of events may take several minutes to process.
- OLM files from Outlook for Mac 2011 use an older format. Most convert correctly but test with the free trial first.
- Private event flags may not transfer to all calendar apps depending on how strictly they follow the ICS standard.
Frequently Asked Questions
Can I import the converted ICS file into Google Calendar?
Yes. Google Calendar accepts ICS files directly. Go to Google Calendar Settings, click Import, upload the ICS file, and choose which calendar to add the events to. All events from the ICS file will appear in your Google Calendar after the import.
Will recurring events convert correctly from OLM to ICS?
Recurring events do convert with their recurrence rules intact. ICS supports RRULE entries which define the recurrence pattern. Most calendar apps handle these correctly on import. However, very complex custom recurrence patterns may not display identically in every app.
Does the converter handle multiple calendars within one OLM file?
Yes. Outlook for Mac allows multiple calendars like Work, Personal and Holidays. Turgs OLM Converter Wizard recognizes each calendar folder separately and can export them as individual ICS files, making it easy to import them into separate calendars on the destination platform.
Do I need to keep Outlook for Mac installed to run the conversion?
No. Turgs OLM Converter Wizard is completely standalone. It reads the OLM file directly without needing Outlook for Mac installed anywhere. You just need the OLM file itself and a Windows machine.
How large can the OLM file be?
There is no strict file size limit. The tool handles OLM files of several gigabytes without issues. Larger files simply take more time to process. A 1GB OLM file with mixed email, contact and calendar data typically converts in 5 to 10 minutes on a modern PC.
Can I convert OLM contacts to vCard or OLM email to PST as well?
Yes. Turgs OLM Converter Wizard handles all data types in an OLM file, not just calendar events. You can convert OLM emails to PST, EML, MSG or MBOX formats, and OLM contacts to CSV or vCard. Each output format is selected separately in the tool.
