Microsoft is ending support for the legacy Basic Authentication in Office 365. As a result, older email clients that use Basic Authentication will no longer be compatible with Office 365 services. This change impacts all devices, including desktops, laptops, smartphones and tablets.
What is changing?
Although it is simple to set up and use, Basic Authentication makes it easier for attackers to capture users’ login information and increases the chance of this login being used to access multiple systems. Because of this security vulnerability, Microsoft has announced that it will no longer support Basic Authentication for Office 365 email, in favor of the more secure Modern Authentication. On March 28, 2021, the University of Chicago will turn off Basic Authentication for all devices accessing University Office 365 email. If you are interested in knowing more, please visit our Modern Authentication FAQ.
For reference, the following operating system versions and email applications support Modern Authentication.
|Device Type||Operating System Version||Email Application|
|Windows||8.0 or later||Outlook 2016 (exchange only, no POP or IMAP)
Outlook 2019 (exchange only, no POP or IMAP)
Outlook – Office 365 (exchange only, no POP or IMAP)
Windows 10 Mail (exchange only, no POP or IMAP)
Thunderbird v78 or later
|Mac||10.14 or later||Apple Mail
Outlook 2019 for Mac (exchange only, no POP or IMAP)
Outlook for Mac – Office 365 (exchange only, no POP or IMAP)
|10.13 or later||Thunderbird v78 or later|
|iOS (iPhone, iPad)||11.3.1 or earlier||Apple Mail
Outlook for iOS
|Android||8.0 or later||Outlook for Android|
|Linux||—||Thunderbird v78 or later
Outlook on the web
If you are using one of the following types of email protocols, you may attempt to fix the problem yourself. Otherwise, please feel welcome to contact Social Sciences Computing Services to help you apply the fix.