Microsoft on Tuesday made available yet another in a seemingly endless stream of interim product updates with the release of Windows Server 2003 Release Candidate Zero (RC0).

The software is a preview of technology that will be included in Release Candidate 2 (R2) of the server operating system, which is expected to be available before the end of the year, according to Microsoft
Infor World :: August 30, 2005

Or straight from the horse's mouth :