do I need a server?
Network File and Print share
Data management and automated backups
PBX network phone system
Network video recording
web and self hosted application
and many more. If your are running a business and do not yet have a server then get one! If you are already running servers in your business environment consider the age of the equipment you are currently using and the methods currently in practice to evaluate the necessity of upgrading your current configuration.
Linux solutions and strategies can usually save you on licensing and hardware requirements of other operating systems and allow you to focus on reliable hardware and offer the equivalent application features or better. Have you ever backed up a file on a server and infected the server backing up that document? Linux servers are not susceptible to Windows viruses and hence this would not have impacted the server.