Calendar - Exchange sync issue

I found some posts on other sites that say the problem relates to time zone support, but when I try those solutions of toggling the time zone support I still have the error. +1 people having this problem.

+1 -- only happened after upgrade to Mountain Lion. Have tried the time zone support, deleting all Exchange accounts in Calendar, Mail, Notes and Contacts, and then adding again through the system prefs. It'll work for about a day or two, and then the problem returns. Events show up just fine on the iPad and iPhone, but problems with iCal.

I have Outlook for Mac 2011 on my machine and no sync problems. But I hate being forced to use it.

I'm using 10.8.1.

I have been having these issues since 10.7. I just recently got a new MacBook Pro Retina. I did NOT migrate my data, because I wanted to see if we were still seeing these issues. So from a fresh install, I connected Callendar.app to my Exchange 2010 + SP1 environment (no rollup updates or anything other than SP1). I still get the same thing:

- Calendar can't save the event "<event name here>" to the Exchange server.

- The account "<calendar name here>" currently can't be modified. To discard your changes and continue using the version of your calendars that's on the server, click Revert to Server.

I called apple support and was immediately "transfered" to microsoft support. But in reality, they simply transfered me to Microsoft Professional Servers so that I can could pay $500+ to have them look into my Exchange Server.

I called back and spoke to another person at Apple. They informed me that they don't "support" servers. I explained to them that this is not an Exchange Server issue, but rather a "Calendar.app" issue. This is a read-only calendar that I am connecting to as a delegate. The Calendar.app should NOT be trying to "save an event to the exchange server."

This was terrible support from Apple... I hope they fix this issue.

Similar problems started appearing for me weeks after installing 10.8.2, suggesting another triggering cause. I have tried various fixes suggested in this and other threads, with no success. Besides treating meetings as invites I get multiple invitations for every appointment in my calendar - sometimes as many as a dozen sent to my email account.

I don't know of any current support issues opened with Apple. My issue was resolved by deleting the Exchange meeting and resetting it up to only repeat for 6 months. So maybe Calendar.app has a bug in that it can't sync past 6 months or so?

The other issue that I am having now with Calendar on 10.8.2 is that CalendarAgent is consuming all my memory. This laptop has 16G of ram. It seems to be the case that when I close my laptop for the evening, CalendarAgent starts consuming both cpu and memory resources. I just opened it this morning and read your message about this Exchange Sync issue and noticed that I was 11G into swap! The workaround is simply to Force Quit the CalendarAgent and then swap returns to a reasonable 1-2G (my real memory goes down tremendously too).

I need to open an issue on that CalendarAgent issue, but just haven't had time. When I called Apple regarding the Exchange sync issue, they told me to hold and forwarded me to MS support 😟

Agreed. I fixed mine but only by deleting the account and then re creating it. Once re created it syncs straight away. It is working properly.....for now. It doesn't take long. Certainly quicker than fiddling around trying different fixes.!!

I have been seeing the same problem and also tried all the fixes, including deleting my calendar settings and setting them up again. That does fix it, or a short period of time. I also deleted the specific events causing the problem in question and recreated them, and that also fixes it. For a short period of time.

All the events I am having this problem with are actually on my wife's shared calendar (it does not do it with my events on my calendar), but she has the same problem with events on my calendar she shares with me. And like someone else mentioned, the problem appears to be related to events with no end date in sight. My wife sets up lots of those of things she does regularly so they go into the future forever (until she changes them or decides not to do them), and it is only those events that seem to be having the problems, at least right now.

I sure hope there is a fix for this as it is extremely annoying!

This fix remains only temporary for me. Seems to last longer on my MBA than on my Mac Pro--I have no idea why as they are both running 10.8.2 and have identical account configurations. So frustrating.

I do have a similar problem. My calendar syncs but only old objects up unitl about 6-7 months ago. Does anyone have any idea what this could be? I also get a small notification next to my exchange calendar in the left frame of calendar but I can not make out why. Is ther anyony who can tell me where I can find the similar windows in calendar as I can get in mail with the connection information and activity reports?

Still no resolution. Like others, deleting and recreating the account does not make a difference. In fact, behavior is exactly the same on two different Mountain Lion machines connecting to the same Exchange account. And given that this had worked fine prior to the OS upgrade, on both machines, suggests to me that this is very clearly a Mountain Lion issue and not a Microsoft issue as some Apple folks seem to believe.

I had a suspecion that reminders have something to do with the problem but I haven't quite pinpointed yet.

It wasn't Mountain Lion that did it to me — started when we switched Exchange hosts this summer. Though maybe that just means Apple was already getting it wrong in Lion. I dunno.

In any event, I'm not ready to let Microsoft off the hook as long as that monstrosity known as Outlook (Windows) is involved.

Meanwhile, we've got two iPads and an iPhone connected to that same calendar and they don't have any problems. I still don't get why iOS has to use ActiveSync and the Mac doesn't, but maybe we'd be better off if it did…

I dunno.

"The account "Exchange" currently can’t be modified. To discard your changes and continue using the version of your calendars that’s on the server, click Revert to Server."

I have the same issue as most of the other posters. Nothing I've tried has made a lasting difference. The same Outlook/Exchange account works perfectly with my iPhone. This has got to be a hint about waht the underlying problem is - or how to solve it. Anybody have any new ideas?

Same issue here on OS X 10.8.2. Re-creating the Exchange account seemed to solve the problem, but it came back as before a few weeks later.

The same account syncs perfectly from my iPhone, so I guess the issue is not on the Exchange side.

Same problem for me here too. Does anyone from Apple read these posts? It would be good if you could tag someone from Apple like in a Facebook post to get their attention! Oi, APPLE, what have you got to say for yourselves about this?