For a 10,000 person company you could end up managing
a Linux based departmental server network of File/Print/DNS/DHCP
and others by substituting approximately 60-70 Linux
administrators with Windows administrators who typically
cost about 30% less than their Linux counterparts
- which is a saving of approximately 1.5 Million
per year. Every company is different and these numbers
will vary based on your specific needs, server count
and what you are using Linux for. It is important
to note that these savings are on top of anything
you'd save by using Linux for departmental servers
and the savings that would accrue due to the increased
uptime of your network.