ContactOffice is now a CalDAV server: you can read and write events from CalDAV software such as Mozilla Sunbird, Mozilla Lightning (a plug-in for Thunderbird), Apple iCal and also iCal on iPhone (version 3.0 is needed). Note: Microsoft Outlook 2007 has no CalDAV features.
For other software, see http://caldav.calconnect.org/implementations/clients.html
The settings depend on the software. Please log [...]