I recently updated my iPhone to IOS 5.0. I was syncing my iPhone calendar with my Yahoo Calendar using CalDav. After the upgrade the syncing stopped working. I tried deleting the calendar sync profile and re-adding it, but when I get to the step where it verifies the settings, it fails. What can I do to fix it?
Here's what I did to fix the problem. I got the answer from this forum post.
To re-add your Yahoo Calendar CalDav account: