"Alerts created in google calendar directly synchronise correctly to both iCal and iPhone. I have discovered that the issue is when creating an event in iCal, and setting the alert to be 'Message with Sound'. If the option for 'Message' is selected, then he alerts syncronise correctly in google cale
"I was at the apple store and I had to ask and the reply was that since the CalDav is used for business purposes; like sync with work, and when you put a location it tries to look for a location for that Event and Google Calendar for some reason has not yet able to configure this feature. So the bot
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Alerts not syncing to iPhone when creating google calendar event from iCal
Apple - Support - Discussions - iCal Location shows with exclamation ...
