Exchange server does not work on iOs 11.0.2

Just to add to this, I got the problem resolved for the user reporting the problem at my company.

Exchange 2010 has a hard limit of 10 ActiveSync partnerships. If you attempt to add more, they won't work. This isn't a problem for most, but for people with multiple devices and people who frequently upgrade / replace their devices, this is an issue, as it proved to be in this case.

Deleting an account from a device does NOT delete the partnership on the Exchange Server. The Exchange Administrator needs to go to your account on the server under Manage Mobile Phone and remove the partnership for any device(s) you're no longer using. Note that the Outlook app counts as a separate device, so if you were to set up both mail.app and Outlook.app, that counts as 2 partnerships, even though they are on the same device.

Hopefully, this will help point someone in the right direction.

I agree with KiltedTim that this is most likely an issue that needs to be resolved through your help desk. If you also see my reply below, the problem that existed between Exchange and iOS 11 was fixed in the 11.0.1 update.

How to back up your iPhone, iPad, and iPod touch - Apple Support

If you decide to backup using iCloud, just be aware that you only get 5GB free. Beyond that you will need to upgrade to a larger iCloud plan.

Buy more iCloud storage - Apple Support

I was able to fix this problem by doing the following steps:

Unable to Verify Information: Before You Try Anything, Try This

Delete your Exchange account and add it back again

1. Go to Settings > Mail > Accounts > Tap Exchange Account > Delete Account
2. Next, reset your wireless network. Go to Settings > General > Reset > Reset Network Settings
3. Restart your device by pressing and holding the Sleep/Wake button until a red slider appears and slide the slider. Then turn your device on by pressing and holding the Sleep/Wake button until the Apple logo appears
4. Enter WiFi credentials and passwords again if requested
5. Add your Exchange Account again, go to Settings > Mail > Accounts > Add Account
   • If you see a prompt that asks “Cancel, Trust or Continue,” select TRUST

Above info obtained from: https://appletoolbox.com/2013/05/exchange-account-unable-to-verify-information-f ix/

Hi,

For weeks since iOS 11 I had problems with my exchange business account. I am on iOS 11.0.2 now and today I found a solution!!

I used outlook app from AppStore and set it up in advanced as Exchange. It works!! Hope Apple and micro bots solve their issues as the create a lot of trouble to customers.

Hey guys,

We are having the same issue. It works using the Outlook app, but no matter what we use within the "add account" settings, we keep getting the error unable to verify settings. But it works on iOS 10.2, I can login to the account with no issues. But on 11.0.2, it will not verify even though I am using the same email address and password. Any suggestions because using the outlook app, I can sync the notes from notepad?

FWIW, Ihad my first report of this from a user today. It's working just fine for everyone who had a device with the account set up and working prior to updating.

The difference here is someone who got a new iPhone 8 with 11.0.2 on it trying to set up the account for the first time.

This issue was already resolved with the 11.0.1 update

If you can't send an email with iOS 11 and an Outlook.com or Exchange mail account - Apple Support

You may want to contact Exchange support as I have iOS 11.0.2 and use Exchange for work on it without any problems. It syncs my email, calendars, reminders, notes, etc.

There's always a chance. You could try a reset and a restore. Just make sure you have a backup first if you try the restore.

Doesn't sound like it. Contact your Exchange administrator / IT help desk.