Final answer:
The APNs provide messaging and collaboration services such as email, instant messaging, video conferencing, and shared calendars.
Step-by-step explanation:
Four messaging and collaboration services provided by the APNs (Access Point Names) are:
- Email: Email services allow users to send and receive electronic messages, attachments, and communicate with others.
- Instant Messaging: Instant messaging services enable real-time text-based communication between users, facilitating quick conversations.
- Video Conferencing: Video conferencing services allow users to have virtual meetings with audio and video capabilities, enhancing collaboration between individuals in different locations.
- Shared Calendars: Shared calendar services provide a platform for scheduling and managing events, appointments, and meetings collaboratively among multiple users.