![]() This is often done in websites devoted to particular events, conventions, meetings, concerts, and the like. Individual event listings can also be provided in iCalendar form to be downloaded, attached to e-mail, and so on. Read-only access to subscribed calendars can be done with the HTTP protocol, but the CalDAV protocol (based on WebDAV and defined by RFC 4791) permits both reading and writing for full calendar syncing across multiple users (requiring both a client and a server that supports this protocol, and whatever permissions are needed to have access to the particular calendar involved). Various calendar software (such as the calendar app on iOS or Android devices) will let you subscribe to a calendar URL and will automatically fetch updates so that whenever you view the calendar in your app it will be up-to-date. Subscribable calendars can be created by creating and updating a file in this format that is accessible on the Internet via a URL (where the URL stays the same even as the file is modified to reflect updates to the calendar events). ![]() However, in their defense, what they originally supported was vCalendar, a format which is a predecessor of iCalendar and is very similar in structure when the iCalendar standard was later developed from it by other vendors, Microsoft only partially supported it at first (though support improved in later versions). Microsoft Outlook does the typical Microsoft thing of supporting something vaguely resembling the standard but full of quirky incompatibilities. People often associate it with Apple's iCal program (now just "Calendar"), but it is a standardized format with an official RFC document ( RFC 5545) and the format is supported by many calendar programs including Google Calendar and Mozilla Lightning (plugin for Thunderbird). ICalendar, or ICS, is a standardized format for storing and transmitting calendar data, including scheduled events and "to-do" lists.
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