Hi,
removing and re-adding the calendar did not change anything. I removed the subscription. Then I added a new subscription with my TripIt feed URL. The calendar showed the same events as before, and it even showed the "last refreshed" timestamp from the previous
subscription, even though I had deleted that subscription!
In the meantime, the calendar did update once, about 80 hours after the time I first added a subscription based on my TripIt feed URL. I has not updated since. So, the issue doesn't seem to be that outlook.com does not pull updates from the external feed, but
that it only does that very infrequently.
Is this expected? What update frequency should I expect for external feeds? How often does outlook.com refresh subscribed calendars? Like I said, the feed itself works fine and other software like the OS X calendar application and the Google calendar see the
update minutes after a change is made. With outlook.com it seems I have to wait for days. This seems odd.