"Linux remains overmatched in the 32-bit world on the desktop.
There is just too large a base of Windows users and related
applications for Linux to dominate the market in a reasonable
period of time. However, transitions breed change, and the industry
is about to take a big step into the 64-bit world, where the
playing field is either level or actually might favor Linux.
"Unix still owns the 64-bit server space. Microsoft, as always,
has moved into this space with an impressive bundle of tools, but
64-bit servers power the most conservative and mission-critical
areas of computing--areas that are much more concerned with
security and reliability than with the benefits associated with
using Windows. In fact, 64-bit server environments tend to be
highly customized, which nearly eliminates the core
benefits--including ease of use and compatibility--normally
associated with Microsoft's platform..."