To achieve greater competitive strength and to address the problem of compatibility among hundreds of Linux distributions, second-tier Linux vendors SCO, Conectiva, Turbolinux, and SuSE created a UnitedLinux movement to make the different versions more compatible. Red Hat and MandrakeSoft have not joined the effort. This continuing lack of unity may possibly drive the various distributions of Linux further apart technically. It is still uncertain how vendors can generate revenue through differentiation without causing customers to be locked in to a single distribution as the kernel and surrounding middleware and utilities become customized (source: Broersma, Matthew. “Linux Vendors Stand Behind UnitedLinux.” ZDNet News.com, May 30, 2002. Available http://zdnet.com.com/2100-1104-928518.html ).
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