MacRumors.com

Apple has today announced that the release of MacOS X 10.5 Leopard will be delayed until October due to the development of iPhone.

iPhone contains the most sophisticated software ever shipped on a mobile device, and finishing it on time has not come without a price -- we had to borrow some key software engineering and QA resources from our Mac OS® X team, and as a result we will not be able to release Leopard at our Worldwide Developers Conference in early June as planned.

Apple goes on to state that while Leopard will be feature-complete by WWDC, they could not "deliver the quality release that we and our customers expect from us." As if to demonstrate that point, Apple recently released a new build of Leopard which continued to contain a long-list of known issues.

Developers will be given a "near-final" beta copy of Leopard at the Worldwide Developers Conference in early June.