The problem is that no matter what I do, I can't get the built in calendar to stop posting reminders. Every time a reminder goes off, I get two notifications. I've gone into the default calendar app and made sure the notifications are off, but when I get a reminder, it appears that the setting gets turned back on. This is not one of the apps that can be disabled either.
I've also gone in and deselected all calendars from the app, so that it should not in theory contain any appointments anyway.
I'm not rooted, but I'm hoping someone else has had this and found an answer.