Apple on Tuesday published a new support document on its website which has acknowledged an issue with the Mail app in iOS 11 where, Office 365 and Exchange customers are seeing their messages rejected by the server.

UPDATE: Apple has confirmed that updating to iOS 11.0.1 or later fixes this issue.

If your email account is hosted by Microsoft on, Office 365 or an Exchange Server 2016 running on Windows Server 2016, you might be greeted with an error message when trying to send an email with iOS 11.

“Apple is working closely with Microsoft to resolve the issue and will release a fix soon in an upcoming software update,” according to the support document.

Microsoft issued a support document of its own acknowledging that iOS 11’s Mail app is incompatible with, Office 365 or Exchange Server 2016 running on Windows Server 2016.

The Windows maker offered the following workaround until Apple releases a fix:

To work around this issue, download the free Outlook for iOS client from the App Store. The Outlook for iOS client fully supports various email services, including, Office 365, and Exchange Server 2016.

If you use the Mail app to sync data from Exchange Server 2016 that is running on Windows Server 2016, you can ask the system administrator to disable HTTP/2 in Windows Server 2016 as a workaround. The instructions on disabling HTTP/2 can be found in the Workaround section of KB 4032720: How to deploy custom cipher suite ordering in Windows Server 2016.

That’s not the only software issue that has affected Apple’s recent or upcoming launches.

As we reported earlier this morning, there is a bug in the new watchOS 4 software that may cause LTE models of Apple Watch Series 3 to join unknown Wi-Fi networks with no connectivity, which in some cases may prevent the device from using LTE networks.

  • Manuel Jacinto

    Another problem is the keyboard frigidity in ios11, the keyboard is frozen at the time of writing fast on iphone 6

    • Rick Hart

      That is why I never go pass two iOS versions from the original iOS the phone debut with. iPhone 6 here too. Not updating to iOS 11

  • Stefano Polo

    I understand how some minor bugs don’t get caught during their Beta releases to Devs, but how did this not get caught??? Especially since now they allow non-Devs to download and use Betas

  • Daniel T

    I have another issue withe the Mail app. When viewing an emal and I press back it goes back to my inbox and immediately opens the search function.

  • SparkMail

    My team located this bug in iOS11 beta, so everything works fine in Spark. Delightful UI and UX, Smart Inbox, Integrations and much more, give it a try!

  • Jeff Schultz

    Still not working on 11.0.1 for me… did they even test the bug fix? If I restart I get push notifications for about 15 minutes then back to nothing.

    • Tinashe Jani

      My mailbox are greyed out and can’t access them on the new 11.0.1

  • Lisamarie Marks

    it will not even let me open my emails- it just has a circle with a line through it—And that is my business email! Now what do i do

  • Oliver Street

    still broken ios 11.2 it seems that Apple has finally adopted their own version of the old Microsoft motto “DOS isn’t done until Lotus won’t run”