Can someone suggest a reliable tool to convert OLM to ICS?

If you've ever switched from Outlook for Mac to any other calendar app — Google Calendar, Apple Calendar, Thunderbird, or pretty much anything else — you've run into this problem. Your calendar data is locked inside an OLM file, and your new platform has no idea what to do with it. What you actually need is an ICS file, the universal calendar format that works everywhere.

The problem is most OLM converters out there either don't support calendar data at all, or they convert it poorly — stripping out event details, losing recurring appointments, or jumbling time zones. That's not a minor inconvenience. That's your entire schedule at risk.

The Cigati OLM Converter is built to handle exactly this. It accurately extracts calendar data from OLM files and converts it into clean, properly structured ICS files — with all event titles, dates, times, descriptions, and recurrence rules fully preserved. It supports batch conversion, handles large OLM files without crashing, and requires zero technical setup to get started.

Whether you're a professional managing a packed calendar or simply switching platforms, this tool ensures nothing gets lost in translation. For a full walkthrough of the conversion process and pro tips before you begin, the detailed step-by-step blog guide covers everything you need convert OLM files to ICS.

Stop struggling with incompatible formats — try the Cigati OLM Converter tool and move your calendar data confidently today.