This version is preceded by Mac OS X 10.4 Tiger and succeeded by Mac OS X snow leopard. The latest released is 10.5.8 (Build 9元1a) on August 13, 2009. iPhone owners can use it for SMS and MMS messages, too. With Messages for Mac, you can send unlimited messages to any Mac, iPhone, iPad, or iPod touch that uses iMessage, Apple's secure-messaging service.
