"Nothing exists in a vacuum, especially in the world of IT.
While it might be nice to imagine a world where all systems run
Linux, the truth of the matter is that Linux needs to co-exist with
other operating systems to make headway in the business
world--especially with Microsoft Windows, which is too deeply
embedded in corporate infrastructures to be displaced anytime
"To that end, Likewise (formerly Centeris) provides solutions to
integrate Windows, Linux, UNIX, and Mac OS X. Specifically,
Likewise Enterprise and Likewise Open provide integration with
Microsoft's Active Directory, giving organizations the option of
single sign-on for applications and users..."