I use a few Exchange accounts with Apple Mail - its been a bumpy road over the last few releases in my experience. I don't know what the Mail team do but in some releases it works great and then it just stops working properly with Exchange accounts (read/unread not working properly, mail not automatically syncing, mail content not always appearing etc). So far in El Capitan I've been able to add one account - Mail seems fine with that but Calendar doesn't show the associated calendar even though I've made it active. Then when I add a second Exchange mailbox, Mail just crashes immediately and continues to do so until I remove the second account.
Topic:
App & System Services
SubTopic:
Core OS
Tags: