Beta 3 breaks Exchange calendar

I am having issues with more than one Exchange account.

Same problem. Office365. I removed the account completely and added it back in. Mail still works great, but Calendar won't pull anything in. Not sure if this started in beta2 or beta3... but it's definitely a problem right now.

Beta 2 was still working, Calendar in Beta 3 is completely broken with respect to Exchange.

Same Problem here, Calendar doesn't pull anything anymore, even new entries.

Additionally, Console throws tons of error messages (multiline)

re-installed latest beta completel, same error

Beta 4 fixes the Calendar again.

My issue still isnt fixed. Today I re-added my Exchange calendar back to Calendar and accepted 32 invitations that had been sent to me. I accepted them on my Work PC using Outlook.

The Mac Calendar then decided to duplicate those invitations AND resend them out to everyone who was on the original invite.

So even though I was not the creator of these events, Calendar dupplicated them and resent them out to all the invitees, multiple multiple times.

I would say an average of 4-5 times per event. That means i had to end up deleting and apologizing for over 200 invites that went out to my coworkers and faculty (education job) for duplicate invites of events they already had.

So no, I dont think its fixed in Beta 4.

Not fixed for me in GM. Calendar doesn't even show up.