When Outlook 2007 and 2010 subscribe to an internet calendar (via a webcal://
link to an iCalendar or vCalendar file), how often do they auto-update? Is there a way to configure this, either in the file downloaded or in Outlook preferences? I know the file can specify a minimum refresh interval (via the X-PUBLISHED-TTL
field), but I don't see a way to explicitly specify a recommended interval.
Apple updates upon app / program startup & every 1-3 hours.
Google Calendar (Android) Google Calendar updates feed information once every 24 hours.
On their Calendar Help page it has changed from "every few hours" to "up to 8 hours" and now to "up to 12 hours." Note: It may take up to 8 hours for changes in ICS feeds to reflect in your Google Calendar.
For Outlook 2013 if you hit send/receive that will sync the calendars as well. To adjust that interval go to File > Options > Advanced then scroll down to find Send/Receive. The options to adjust the intervals for auto Send/Receive are found there.
Outlook relies on the custom property X-PUBLISHED-TTL to set the download frequency but unless set in the file you subscribe to, there is no way to force within outlook an update frequency (nor in google calendar).
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