Q: Yosemite Calendar - Outlook/Exchange calendar events keep updating and sending out invitations to participants

I have the exact same problem. This never occurred before -- I've been syncing Exchange with prior versions of OS X for a while. Ever since I upgraded to Yosemite, any meeting I have scheduled sends out updates on its own. It seems to happen 15 minutes before every meeting. This is my default reminder setting to participants for meetings so I'm guessing the reminder may be triggering a "ghost update" which causes it to send the invite out. It's so annoying.

I have noticed the same thing - there is no rationale behind. Cant spot a consistent reason for the constant sending out. Some go out 4-5 times in a row.

I'm having the same issue as well.  Every time I get a notification for a calendar event that I created and interact with it in some way, either by opening it or hitting the Close button, it resends the invite to all the recipients.  This is extremely frustrating for me and annoying for all the recipients because they keep getting spammed with the same calendar invite.  Another issue is I'll open the calendar event, and it will think I modified it in some way, and it will not let me close it without reverting whatever change it thinks I made and sending it out again.  It should not force me to resend an invite that I did or didn't edit.  This makes working from my Mac extremely irritating, and I'll have to switch to my PC if this doesn't get fixed.

I am having the exact same problem that all are mentioning in this thread.  It is EXTREMELY FRUSTRATING!  This never use to happen with Mavericks.  I had to buy BusyCal $49 as a work around until Apple hopefully fixes this.  Apple, please fix!

2013 MBA Yosemite 10.10.1

Another "me too" post here. My machine will send out updates without me ever touching the event! It's crazy. It's not always just one event either - today, blank updates got sent out for two separate events at the exact same time.

Further testing confirms what Eric491 said above...if I do anything with a meeting notification for a meeting that I have setup - snooze it or close it - it will send out a blank update.

Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.

Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.

Feedback

Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.

Feedback via Apple Developer

Same problem here.

Had a call today with Apple Support, but they couldn't solve the issue. Instead they recommended to contact Microsoft and blamed it on Outlook365/Exchange. I can imagine what they will say...

I have the same exact problem and I am using Office 365 Exchange account and I know it is not an Office 365 issue because I am now using BusyCal instead of Apple's native Calendar app and everything works fine with BusyCal.  Since switching to BusyCal for my calendar, I have had no issues but it cost me $50 for BusyCal which I should have not needed to buy if Apple would do a decent QA job on their own apps.

I've just been doing some reading and stumbled across this article... might help some people out, as I think it seems to follow the same principle of Apple related products. I'll try and test it the next time I need to do a meeting request...

http://www.slipstick.com/outlook/calendar/iphone-and-the-meeting-request-bug/

I have this problem as well.

Another me too post. Seems to start and stop me but I can't work out what has changed to stop / start the behaviour.

Very embarrasing

@Apple - please don't force me to revert to using Outlook again... PLEASE!!!

Another me too here.  I'm able to consistently reproduce this issue - it always happens when interacting in any way with a meeting notification in Notification Center.  Whether I dismiss or snooze the notification, a "No Response Required" meeting update email is sent to all attendees.  I've moved back to Outlook for Mac which is definitely a downgrade in experience

Ideally, Sunrise Calendar for Mac will start supporting Exchange and we can all let go of Apple Calendar for good.

I upgraded to 10.10.2 this morning, and it looks like this problem might be resolved. I've snoozed a couple of meetings that I was the organizer of, and no updates were sent out.

This line in the 10.10.2 release notes doesn't exactly describe what I think the problem is, but it's at least vaguely in the neighborhood:

• Fixes an issue for Microsoft Exchange accounts where the organizer of a meeting might not be notified when someone accepts an invitation using Calendar