In terms of market share, Microsoft controls quite a significant
amount over Novell. However, there are still quite a lot of Novell
installations around.
Both have their strength and weakness, and one should not ignore
any of them. Cause you will not know what your future company
deploys. =)
Do try to pick up Linux though, besides Mandrake, Suse is quite
friendly to newbies. Though there is quite a sharp learning curve,
it's worth it. =)