Attention adults working in the real world: Do not upgrade to iOS 11 if you use Outlook, Exchange

Kiss your Microsoft email goodbye for now

Updated Apple's latest version of iOS, namely version 11, may struggle or flat-out fail to connect to Microsoft Office and Exchange mailboxes. That's a rather annoying pain for anyone working in a typical Windows-based work environment.

The Cupertino idiot-tax operation admitted this week that iOS 11 contains a bug that potentially leaves users locked out of Microsoft Office 365, and Exchange inboxes, and that the mobile OS pops up an alert that reads "Cannot Send Mail. The message was rejected by the server."

"If your email account is hosted by Microsoft on or Office 365, or an Exchange Server 2016 running on Windows Server 2016, you might see this error message when you try to send an email with iOS 11: 'Cannot Send Mail. The message was rejected by the server'," the owner of ClarisWorks claimed.

"Apple is working closely with Microsoft to resolve the issue and will release a fix soon in an upcoming software update."

No word yet on when a fix for the problem will be pushed out to fans.

While Apple hasn't made the iOS 11 update mandatory, those lining up for a new handset Friday will have no choice but to use the latest flavor of the operating system. The iPhone 8 and 8 Plus are set to hit shelves on Friday, September 22.

People who rely on, Office 365 or Exchange for their work and/or personal accounts should obviously avoid installing the update – or try using the crippled Outlook app, which apparently still works. If you don't much mind being locked out of inbox, you can get iOS 11 on your iPhone or iPad by going to:

Settings > General > Software Update

The bug is the latest problem to befall iOS 11 since its September 19 release. El Reg has already sounded the alarm about potential pitfalls in the update: it won't run any of your older 32-bit-only apps, and you can't easily turn off Bluetooth and Wi-Fi because they're needed for file and smart watch synchronization.

In addition to some new features, the iOS 11 update contains a handful of security bug fixes, and fortunately none of them critical. These flaws can be exploited to crash software and perform cross-site scripting and address bar spoofing. So the choice is: update now and, on top of the usual point-zero Apple release bugs, lose access to Outlook and Exchange and have Wi-Fi and Bluetooth stuck on – or don't upgrade and don't get the security fixes.

Given the security vulnerabilities are not critical, you may be better off just waiting for the more polished 11.1 version to land (and the inevitable 11.1.2 update that'll fix bugs in the bug fixes). Your humble vultures have heard of businesses stressing to staff this week to not install iOS 11 on their devices or they'll be locked out of their corporate Microsoft-powered email. ®

Updated to add

Apple has released iOS 11.0.1 to fix the connection headaches. Install it to avoid any troubles reaching Microsoft-powered inboxes.

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