Import calendars into Outlook - Microsoft Support
https://support.microsoft.com/en-us/office/import-calendars-into-outlook-8e8364e1-400e-4c0f-a573-fe76b5a2d379
WebIn Outlook, select File > Open & Export > Import/Export. In Import and Export Wizard box, select Import an iCalendar (.ics) or vCalendar file (.vcs), and then …
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