C'est dans les FAQs :
Will it work with Netscape's calendar server?
The calendar does not currently work with Netscape's calendar server. To share calendars, subscribe to remote calendars using Tools->Subscribe and publish your calendars back to a webDAV enabled server by using Tools->Publish.
[^] # Re: Calendar bientôt intégré dans Mozilla
Posté par thoms . En réponse à la dépêche Calendar bientôt intégré dans Mozilla. Évalué à 1.
Will it work with Netscape's calendar server?
The calendar does not currently work with Netscape's calendar server. To share calendars, subscribe to remote calendars using Tools->Subscribe and publish your calendars back to a webDAV enabled server by using Tools->Publish.
http://www.mozilla.org/projects/calendar/(...)