File server allows your data to be shared among multiple PCs within office.  The data stored on the servers can be protected from unauthorized access.

All emails will be stored on the server instead on the PCs.  With the mail boxes on the server, you will be able to access your emails via different devices.

With print server, all printers can be configured to connect to the print server so that all printers can be shared within the office network.

All data on the server will be backup so that the data can be restored after a data lost event.  The backups can be scheduled to run automatically.