The Open Group, a vendor- and technology-neutral consortium focused on open standards and global interoperability within and between enterprises, today announced that both Mac OS X Leopard and Mac OS X Server Leopard from Apple Inc. have been awarded a certificate of conformance to the UNIX 03 standard. UNIX 03 is the certification mark for systems conforming to the latest UNIX product standard developed by The Open Group Platform Forum for the Single UNIX Specification version 3. This certification is significant as it further broadens the installed base of UNIX systems in the marketplace to include a popular desktop platform. In addition, Apple's UNIX 03 certification is a milestone for the UNIX certification program since Mac OS X is the first operating system derived from the open source BSD base of historical UNIX products to meet the certification requirements.