"The past year has brought a new contender, once dismissed as a
hacker's operating system, into many organizations' data centers:
Linux. Although the hallowed ground of the data center
traditionally has been reserved for high-end OSs, less
buttoned-down OSs have been making inroads there. Linux is one of
these relative upstarts.
"In the data center, Linux performs two main duties:
replacing Windows NT Server or acting as a small UNIX server.
Since Linux provides a UNIX-like OS, you'd expect it to handle most
chores UNIX can, and this is largely true."