You can export your OX Calendar appointments from OX and place them within any programme of your choice
See the below guide for how to export your calendar:
1: In OX Webmail, click on the "3 lines" (hamburger) menu in the top left.
2: Click "Calendar"
3: Highlight the calendar you'd like to set up syncing for, select the 3 dots and in the drop-down, select Export.You can now use this .ics export in any programme of your choosing.