iOS 15.1 Calendar app is laggy and unreliable

Same problem. Same equipment iphone pro11. Same ios 15.1 I have to force close the calendar everytime to fix.

I did turn off exchange calendar and restart. Fixed briefly and then with every calendar update went wonky

Has anyone submitted a bug to the MSFT team on that? I use no on prem Exchange, only 365 so it clearly also cuts across MSFT 365 Exchange servers, which run the most recent Exchange versions and updates

My IT department originally demanded everyone update their iPhones to 15.

I did as I was told by the deadline and discovered this exchange issue.

I let my IT team know and they said I was the only one having the issue.

yesterday they sent this round:

Please note that Apple have acknowledged an issue between its latest version of the operating system 15.1 and its compatibility with Microsoft’s Outlook calendar. Please do not upgrade to this version at this point – the last approved and stable version was 15.02 - we will advise when Apple have released a newer version that works with Outlook.

Microsoft recommend that you download the Outlook app from the app store and use the outlook application instead of the default Mail application that comes with the Apple operating system on an iPhone.

I had apple support on the phone for 2hrs yesterday trying many things - still no good. They even got me to remove work profiles off phone, remove calendar app etc etc - all no good. Clearly something hasn’t been tested properly in this upgrade which I have experienced with apple previously. They went away to find a solution.

not as good as they make out.

Totally agree. Proper poor testing and customer quality. I had a previous upgrade that actually destroyed my phone and after asking apple for a new one as it was clear they caused fault - they still charged me! Unreal

I am experiencing similar issues with the calendar showing appointments on the wrong day and such. What helped me was to briefly activate the flight mode, after deactivating it the calendar is back to normal. Hope this helps.

It’s definitely a bug. Exact same problem. Force closing and reopening the calendar app seems to reset the calendar and the correct titles then appear on the meetings for a short while before it goes haywire again.

No it’s not fixed. All day today I’ve been seeing incorrect info about upcoming meetings, missing meetings that are invisible, and so on. I’m having to also use the Microsoft and Google apps to see a real view of those two calendars instead of being able to see them on my native calendar app on the iPhone.

There’s clearly inconsistent responses here which proves apple have not fixed the problem. Does anyone know how we get this highlighted in the public domain? Apples arrogance of not recognizing the crap they have caused should not go without some pain. 15.1.1 should have been focused on this issue instead of some other menial problem. Not impressed at all.

I have the same issue. Calendar is freezing. I have an exchange calendar. Issue prevails in iOS 15.1 and higher. I downgraded to iOS 15.0.2 and there are no issues in that version. Please rectify this.

Ive actually spoken to apple support twice over the past week. They are clueless!!

no idea about problem, no clue how to fix and no clue about next steps!

and they are supposed to have one of the largest knowledge pools! No chance.

how do we give apple some bad press about this??

I did it with a one-star review on Apple‘s calendar app in the app-store:

Hi Apple, since the upgrade to 15.1 your calendar app is laggy and does not work. It is unusable for exchange-users. Hence, you block many of us using it as a business tool. The support forum has many threads on this and you don‘t react. I recommend everybody to install the Google-calendar app. This solved the problem. Your app has been deleted. Period!

Strange now is that my iPhone 6s does not get IOS 15.1.1 offered, while it is announces since a few days.

Before it got updates offered very short after Apple published the release notes or even before.

Anyway, the Calendar issue persists.

I have just spoken to the third apple support clown who has said the engineers are blaming this issue in work profiles put in calendar!! Fuming. I have already removed my profile without any change yet apple are using this bullshit as an excuse for their problem.

does anyone know how to remove latest 15.1 and revert back to previous version?

iOS 15.1.1 is only available for iPhone and iPhone 13 models.

iOS 15.1.1 improves call drop performance on iPhone 12 and iPhone 13 models. 

which basically means that you’ll have less dropped calls, and you’ll have better experiences with the phone app.

don’t worry about it, your iPhone 6s is still supported, and should continue getting updates until the release of iOS 16, assuming I understand correctly.