iOS 11 Breaks Office 365 email

September 21st, 2017

iOSTo the point.  If you upgrade your Apple device to iOS 11, your Mail application won’t work with Office 365, or Exchange 2016.

Remember the good old days, where stuff just didn’t work together?  Mac’s hated Windows, Netscape Navigator hated Internet Explorer, and everybody hated disco.

A few years ago, things changed.  Cross-platform Integration became the norm.  Everybody singing Kumbaya around the cyber-campfire.

You’re starting to see a fragmentation again, mostly in the name of security or feature development.

In this case, we’re talking about the latest iOS version from Apple, iOS 11.  The built-in mail application ( simply won’t work with Microsoft’s latest email engines because the iOS connection methods don’t use the appropriate level of security.  Now, you can do a couple of things:

  1. Don’t upgrade (actually, our understanding is Microsoft and Apple are working on a fix for this, so hopefully the delay won’t be for long).
  2. Use the Outlook for iOS client from Apples App Store.
  3. Disable HTTP/2 in Windows Server (DON’T DO THIS!)

For more information, click here or here.  And contact us if you have any questions.

Meanwhile, I'm going to look for my OS/2 disks.