Which of the following is true about Internet Message Access Protocol version 4 (IMAP4)?

IMAP4, or Internet Message Access Protocol version 4, is designed to enable multiple devices to access the same mailbox, which is one of its primary advantages. This protocol allows users to manage their emails directly on the mail server, making it possible for them to view, delete, or organize their messages without needing to download them onto individual devices. This feature is particularly useful in today's mobile and multi-device world, where users may check their email from a smartphone, tablet, and computer.

In contrast, downloading messages to view them is a characteristic of other protocols such as POP3, which means that this option does not accurately reflect IMAP4's functionality. IMAP4 is specifically tailored for accessing emails rather than sending them, distinguishing it from SMTP, which is the standard for sending emails. Lastly, while technology evolves, IMAP4 is not considered obsolete; it is still widely used and supported by modern email clients and services.