Joel on Software refutes the Information Week article that skewers Microsoft regarding Interop with Linux. Apparently you can order a free copy of SFU 3.0 (Services for Unix) or try it out via TS (?). There is also a beta version of SFU 3.5 available over on the main SFU website. One of the nicest features of SFU is the Interix subsystem that microsoft bought a couple years ago and continues improving. Check out this page of ports for SFU 3.5 beta.