I am wondering if it is possible to connect to an external CalDav server not that one that's offered by zimbra. Specifically I want to use OpenCRX's caldav backend to integrate that calendars.

So, when I add a calendar in my account is it possible to reference a different caldav backend? If so how? Or is there an alternative way?

Many thanks in advance.

PS. I understand that this part of the forum is mainly for connecting to the caldav backend of zimbra but since here is a lot of discussion about caldav I think it is the right place to post.

Release 6.0.7_GA_2473.DEBIAN5 DEBIAN5 FOSS edition.