Available in Quicklaunch 4.0.680.0
Quicklaunch uses Microsoft's Exchange Web Services (EWS) to access calendars, mail and user profiles. However, Microsoft will be retiring Basic Authentication for EWS for access to Office 365 in 2021 and will be replacing it with their new Graph API.
Graph API is Microsoft's new interface for accessing office 365 Calendars, Mail, Profiles and other enterprise information. Graph API also uses the Microsoft Modern Authentication which enables application access without requiring to store user IDs or passwords. This will allow your administrator's to grant access to Quicklaunch, rather than Quicklaunch storing user IDs and passwords.
For more info about the retiring of Microsoft Basic Authentication for EWS, please see: https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-april-2020-update/ba-p/1275508
For information on setting up Quicklaunch for Graph API, please see: