1) Axis Open-Xchange webmail
2) Click on the Calendar tab
3) Click the button next to Calendar
4) Click the Export button and proceed to export the Calendar as iCalendar format (.ics)
5) Export Calender will export the Calendar as an export.ics file
6) Log out and re-login webmail again, now select Horde webmail
7) Click on the Calendar tab
8) Create a new Calendar under My Calendars that needs to be included in the exsport file
9) Click the Pencil button next to the calendar name and select the Import tab.
10) Select the export file and click on the Save button
11) Finish