On October 13, 2020, Microsoft will stop supporting Basic Authentication, an older, less secure way of accessing Office 365 services. They also will disable older email protocols like POP, IMAP, and Exchange ActiveSync. When these changes take effect, some older email and calendar clients and mobile apps will stop working with Office 365.
In anticipation of this change and to provide time to address any unexpected side effects, OIT recommends switching to a supported email/calendar client no later than March 1, 2020. For help with this transition, contact the IT Service Desk.