Overnight, Apple released OS X 10.8.4, an update to Mountain Lion that (again) addresses some issues with Messages, as well as some miscellaneous bugs.
Apparently, there was an iMessage quirk that was causing some messages to show up out of order on the desktop app. Also included in the update is a new version of Safari (6.0.5), better support for Microsoft Exchange in the calendar, and a hiccup that was blocking international numbers on the FaceTime app.
The full list of changes is available here. You can download the update here or in the Mac App Store. And next week Apple is hosting WWDC, where we might be seeing the next-generation version of OS X for the first time. [Apple via TheNextWeb]