The mobile usage on smartphones (e.g. Android, iPhone) and media tablets (e.g. iPad) is supported by open standards such as HTTPS, WebDAV, CalDAV and CMIS as well as apps for the Android and iOS operating systems.
iCal Server was the first commercial calendar server to support the open CalDAV standard.
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iCal Server 2 with improved CalDAV support, a new web calendaring application, push notifications and the ability to send email invitations to non-iCal users.