At the TEC 2023 conference in Atlanta, Greg Taylor (Microsoft) analyzed the four-year project he led to remove basic authentication from Exchange Online. Microsoft will reuse the methods and tools developed for this project when it removes other features from Microsoft 365.
For POP and IMAP access to Exchange Server mailboxes the best practice is to require secure logins.
Why I recommend you don't leave POP and IMAP protocol logging enabled on Exchange Servers.
In Exchange Server 2003 it is possible to connect to public folders using an IMAP4 connection. Is this still possible with Exchange Server 2010?