Hi @John Blair ,
After searching, there is indeed an outlook version that can generate ical URL, there is a related case you can refer to:
https://answers.microsoft.com/en-us/outlook_com/forum/all/how-to-publish-an-outlookcom-calendar-as-an-ical/9fad5765-6b3d-43d6-9950-5211588a3c52
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