Email Issue with Apple Mail & Calendar

As of July 31, there is a known issue with using Caltech Office 365 email on the Apple Mail and Calendar applications where mail and events are either syncing very slowly, or not at all. While we wait for word from Microsoft and Apple, it does appear that the issue can be resolved by updating to the latest Mac operating system, OS 10.12 Sierra. Other workarounds include using the Microsoft Outlook application or webmail ( Note that iOS devices appear unaffected by this.