Google Calendar syncs only two weeks of appointments
I'm on Android 7.1.2 and I'm using Google Calendar to manage my appointments. I have setup my Mailbox.org account as an Exchange account. For some reason Calendar only shows my appointments of about past two weeks. I have a few years worth of appointments that are not synced into Calendar. I've tried another Exchange calendar app and it does sync all of my appointments, so this appears to be a Google Calendar problem.
Is there anything I could try to remedy this situation? I really like Google Calendar so I'd rather not switch to something else.