I am one of 2 for in house IT, we were only only recently established as a department. Without going to far into detail, we outsource our IT so no one person inside the company has access to all the data / can cause data breeches / exfiltrate data. We have pulled that back some since being established. Our server stack is roughly 10 years old and has a bad backup infrastructure. (hence needing upgrade) There are security holes that were not corrected along with many other issues.
Just about everything we run can be moved to a linux machine without issue, which to me is far easier to manage.
Im not looking for linux vs windows, I do get the need for windows, but linux was nearly immediately shot down for something as simple as network monitoring (try to find an NMS on windows…there aren’t many…)