Thank you both for your fast answers

Ok, the WebDAV is a special connector interface for the Outlook OX Connector and limited on the features of Outlook itself.
iCalendar is slow (if it used by the whole calendar data). And CalDAV could be a solution for performance reasons (but not for the near future)
The HTTP-API is the current API for OpenXchange. But it is a very proprietary API. Of course, with a good human readable documentation.
But developing JSON-APIs is like developing JDBC with hard coded SQL-Queries (in this century not a very good idea

best regards,
josh.
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