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

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

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, 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

I finally figured it out! Go to settings- scroll to bottom and click on Apps. Click on the Calendar app. Click on Calendar Accounts to show all the accounts you have synced. Click on the first account that is not synching correctly. Toggle off the calendar. Let it delete (don’t worry it will just unsynch it). Then back out of settings. Repeat with all accounts that aren’t working. Restart your phone (not sure if necessary but I did this). Then go back into settings-Apps-Calculator-Calculator Accounts- and turn back on all the calendars for the accounts you turned off. They will take a bit to synchronize but worked perfect. FINALLLLLY!!!

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

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!!!

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 a similar issue, but a little different. Doing a search would only show upcoming events that I’ve recently entered. I could not search for past events …. but all past events I’ve entered DO show on my Gmail calendar. I did not have a problem searching past calendar events prior to V18.1. After many frustrating days trying to fix this…. I found something that DID work for me this morning. Here’s what I did on my iPhone 16 Pro using V18.1

(Note: I use my Gmail calendar as my default)

• Go to “Settings”, scroll to the bottom and select “Apps”

• Scroll to Calendar and select

• Scroll down to Default Calendar and select

I changed my default calendar from Gmail to iCloud Calendar… then select <Back (Top Left On Screen)

• I closed “settings”, then opened my Calendar and verified my Gmail calendar entries are no longer shown

• I rebooted my iPhone. Then I changed my calendar back to my Gmail account

• Go to “Settings”, scroll to the bottom and select “Apps”

• Scroll to Calendar and select

• Scroll down to Default Calendar and select

• I changed my default calendar back to Gmail.

I opened my calendar and it started populating all my calendar events. And now I AM able to search past events in my GMail calendar. Hopefully this will continue to work for me… and maybe my steps will assist with others having this same problem.

Well, I keep on trying. I did a repair of the iTunes AND Microsoft 365. Syncing my phone, the calendar items do not sync.

Just now, I connected up my iPad after updating it to 18.1.1. Contacts AND Calendar items synchronize between my Outlook and my iPad. I entered an item in Outlook, and I entered an item in my iPad calendar. Both items sync perfectly.

I can't comment on the version my phone is running or this post will get deleted. My phone is an iPhone 16 Pro Max, so I'm wondering if anyone has the 16 Pro running the latest 18.1.1 OS and having any luck syncing both the contacts and the calendar items.

I have compared, side by side, the settings on my iPad and iPhone, and I cannot find any differences between them. Major difference is the OS versions. Note, I have been synchronizing my iPad and Iphone for years with iTunes, and I find it odd that it is only the Calendar having issues. Especially confusing now that I know my iPad is perfectly fine.

I really, really, really X's infinity, do not want to reset the phone and go through the hassle of getting things to where I have them now.

I tried a lot of solutions - this worked for me. Thank you!!

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