Ical attribute to set publishers recommended refresh rate

[polymorp]

Ok i'm using outlook 2007 with a ical feed from a different system
(works well) but it seem to keep updating every minute when the send/
recieve group runs which is good but bad as it needs to be upto date
buy not that upto date .

What can I add to the ical file to limit the refresh rate to something
more sensible as outlook mentions it won't update more often then the
publisher suggests but I cannot find out how I as the provider of the
ical i can suggest one.

What's the syntax for specifying update limits in an iCalendar file? I
couldn't find any mention of it in the RFC.

 

[Vince Averello [MVP-Outlook]]

You can create a different send/receive group for your Internet calendars to
set the refresh time

 

[jsntu]

That does work but i was hoping to make use of the TTL type attribute
For RSS feeds outlook seems to respect the <ttl>15</ttl> but i cannot
find what attrribute outlook 2007 expects for ical files

i've tried
TTL:15
X-TTL: 15
X-PUBLISHED-TTLT60M

but that part of the import screen continues to say: "Update limit >
current provider limit: Not Published"