Ohio University

Login security improvements will affect older email/calendar apps

As OHIO and Microsoft move toward requiring more secure methods of signing into online services, some applications like the built-in Mail and Calendar apps that come with Android, iOS 10 or older, Mac OS 10.13 or older, and IMAP/POP clients like Thunderbird, Eudora, and Pine will no longer be compatible. Outlook 2013 and older versions also will be affected. If you use one of these applications, you can expect to hear from OIT in the coming months about upgrading to a supported client or app. 

This change is a part of the normal lifecycle for Office 365. Moving to modern authentication will help protect your account from cyberattacks and safeguard the University’s data and intellectual property. OIT will phase the change in gradually between the end of July and mid November. Doing so will let us work around high impact times of the year like fall opening and finals week. 

Recommended steps 

Outlook on the Web

If you normally use a web browser to check your mail/calendar at https://catmail.ohio.edu, then you do not need to do anything.

Outlook for PC and Mac

Depending on which version of Outlook you are using, you may need to upgrade. 

Mac Mail and Calendar 

  • Mac OS 10.14 (Mojave) and newer: The Mail and Calendar apps that come with Mac OS 10.14 (Mojave) will continue to work. Depending on how you originally set up your Mac, you may need to delete and re-add your email/calendar account profile to avoid a service interruption. 
  • Mac OS 10.13 and older: The built-in Mail and Calendar apps that came with Mac OS 10.13 or older will not work. To continue using those apps, you will need to upgrade your Mac OS to version 10.14 (Mojave), or you can switch to using Outlook.  

POP, IMAP, SMTP or Exchange ActiveSync Clients 

Email applications like Thunderbird, Eudora and Pine that use POP, IMAP or SMTP, as well as mobile devices using Exchange ActiveSync will stop working. We recommend switching to the latest version of Outlook or using the web version of Catmail.

Mobile Apps 

Outlook App: No action needed 

If you are using the Outlook mobile app for iOS or Android, then you do not need to do anything. Outlook is Ohio University’s preferred way to access email and calendar from a mobile device. 

iOS Mail and Calendar 

  • iOS 11 or newer: The Mail and Calendar apps that come with iOS 11 or newer will continue to work; however, you may need to delete and re-add your email/calendar account to avoid a service interruption.
  • iOS 10 and older: The built-in Mail and Calendar apps for iOS 10 and older will not work. We recommend upgrading your device to the latest version of iOS or switching to Outlook for iOS.

Android Mail and Calendar 

Android does not support Microsoft's new method of logging in. To avoid a service interruption, you will need to install Outlook for Android.

How to get help 

For help with this transition, please contact the IT Service Desk.