Unable to sync Calendar App after iOS 18 update

Any updates on this? Same issue on my iPhone 16 pro max. Have done everything possible with corporate IT, and I’ve reset the network settings on iPhone. Exchange calendar still does not sync with iPhone native Calendar or third party apps. Agree that is difficult to keep 2 calendars without double booking or missing meetings. Frustrating since this is a new problem that I haven’t had in the 8-10 years using the same setup.

This is clearly a widespread issue, reading comments on multiple sites (here, Reddit, Microsoft).

Same here, since updating to IOS18, all of my calender entries have disappeared and when I try to restore them from my Icloud there are no calender events there either. Everything else is backed up, my notes, my photos, it's all there, just the calender is empty - it says no archives available. I am freaking out, it had ALL of my appointments and I have no idea what to do now. Help please

Any update? Less than a handful of items will load on my calendar. I’ve checked my settings. Help!

Im having the exact same issue yall, has apple fixed this yet? 🤬

Me, too, and I am so so so very very unhappy ever since doing a Software Update to my iPhone 13 which is not even a year old. I never called Apple to ask for support to do an Update.

This Customer Support person Lisa instructed me to do this Software Update without warning me what would happen after the Software Update which I soon learned the Software Update was the IOS 18.0.1 and now I LOST ALL my contacts and my past present and future calendar appointments.

Now, they tell me they cannot help me to restore or recover my CONTACTS and my CALENDAR.

Apple Customer Support FAILED

Same here. Any updates?

We are having the same issue on my husband’s phone! He tried creating a new calendar and moving everything to that calendar and it had the same issue! But it isn’t affecting any other family member’s calendar. This is BEYOND frustrating because we are missing business meetings!!!

Since updating to IOS 18, all my calendar entries have disappeared. I don’t even have bank/public hols either. Any update from Apple how to fix this?

Me, too! I have a “New” iPhone 13 which is not even a year old and …

Apple Customer Support actually misinformed me by instructing me to do a Software Update 18.0.1 and DID NOT warn me that I would loose my CONTACTS and my CALENDAR.

Now, I desperately need Apple Customer Support which appears to be non-existent to recover my CONTACTS and my CALENDAR.

Same issues for me. Now, I am so very upset as lost ALL my Contacts and ALL my past present and future Calendar appointments simply because without any warning of the consequences was I instructed by the Apple Customer Support “Lisa” to do this UNACCEPTABLE Software Update 18.0.1 😭

I DID have success with contacts, finally. From settings / contacts / contact accounts / exchange, uncheck contacts. Then force a reset of the phone and when it comes back online navigate back to the same place and re-check contacts. THEN on the contacts settings scroll down and change default account to exchange. Now when you go to contacts / lists you should see exchange and your contacts populating. I’ve got 3300 contacts it was fun to watch the number of contacts grow until it was done and now I’m ok. While the calendar issue is SO frustrating and apple support acts like I am the only one with the issue, It just has to be an ios18 issue and fingers crossed it will get resolved with the new AI update at the end of the month.

Wanted to throw my displeasure into the ring on this. I've been researching for two days on what happened. I've been using iTunes on my PC for years to sync my calendar and contacts with Outlook. It's how I've wanted to do it mainly due to company reasons. I just realized this the other day that the calendar is not updating between my iphone/ipad and my Outlook. The Contacts update just fine as they always have.

I've tried several things but nothing I've read is working, and I don't want to flip that switch to iCloud to Merge and lose all my data. I did that with my contacts, and thankfully I had a backup to restore my Outlook back to normal.

I had the same problem after having to get a replacement phone (and update to ios 18). I just solved it by going to the calendar on my phone, clicking on "calendars" and at the top of the list of calendars was a "verify account" line. I clicked on that, and it was all I had to do. Went back to my PC and hit refresh, and I found it immediately matched my phone.

Hope this helps!

This is absolutely ridiculous, my whole calendar is GONE. WTF Apple, Steve would never have allowed this, I'm starting to think Apple hired a bunch of Microsoft guys and here we are..... Apple has to do better, won't be running out buying an Iphone 16 for sure, like R U Kiddin me

I have to wonder what 'calendar' iTunes is saying it is syncing to on my pc, as, obviously, it's not working!