On Linux they can be done more easily remotely. Linux management suits the technical expert for installation and configuration, although it is rapidly becoming more approachable for general computer users. For standard hardware, Linux installation is now straightforward. This saves time. As setup and configuration are rarely performed, it is more efficient for a small organisation to hire someone who is familiar with the system, and Linux is faster to work with for people familiar with it.
Remote access reduces callout fees, and improves response time.
In contrast, there is little an expert can do to avoid NT reboots, draining expensive consultancy minutes. NT remote administration is underpowered. Affordable Linux software is very affordable. It is free. Updates are then available for free over the internet.