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We also encourage you to explore all things Zimbra with our team and members of the community.
CalDAV support in 4.5 is still in alpha. There are several known and unknown issues dealing with various CalDAV clients. If you want to experiment with CalDAV, use the URL http://yourhost/service/dav/username/Calendar . Substitute yourhost and username with your hostname and user name of the account. Mozilla Sunbird and Lightning should work. Evolution client is currently unsupported.