I believe there are many Linux distributions would probably meet your needs but I will go forward with the assumption that as a Windows Administrator you might like the offerings from Novell.
Novell's offerings are good operating systems for those LAN administrators moving from a Windows server to Linux though I tend to recommend Red Hat Enterprise Linux as a better distribution for UNIX users moving to Linux. The community Fedora Core is very similar to RHEL and is a popular choice no matter what the situation.
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