Have you used WS? It is a beast and is totally different. It is also the only option for many organizations as Samba and Linux aren't doable in some cases.
The original interview is no longer available, but here are references.
Microsoft CEO and incontinent over-stater of facts Steve Ballmer said that "Linux is a cancer that attaches itself in an intellectual property sense to everything it touches," during a commercial spot masquerading as a interview with the Chicago Sun-Times on June 1, 2001.
Ballmer was trying to articulate his concern, whether real or imagined, that limited recourse to the GNU GPL requires that all software be made open source.
"The way the license is written, if you use any open-source software, you have to make the rest of your software open source," Ballmer explained to an excessively credulous, un-named Sun-Times reporter who, predictably, neglected to question this bold assertion.