OS X 10.10.4

OS X 10.10.4 was an update to OS X 10.10 (Yosemite) that was released by Apple on June 30, 2015.

Features
The OS X Yosemite v10.10.4 update improves the stability, compatibility, and security of your Mac.

This update includes the following:
 * Improves networking reliability
 * Improves Migration Assistant reliability
 * Addresses an issue that prevented some external displays from functioning properly
 * Improves the reliability of upgrading iPhoto and Aperture libraries to Photos
 * Improves reliability when syncing photos and videos to iCloud Photo Library
 * Addresses an issue that could cause Photos to unexpectedly quit after importing some Leica DNG files
 * Resolves an issue that could delay outgoing email messages in Mail
 * Fixes an issue where a website could prevent the user from navigating away by presenting repeated JavaScript alerts in Safari

Enterprise content
For enterprise customers, this update includes the following:
 * Addresses an issue where OS X systems bound to directory services could stop responding under certain conditions
 * Adds the ability to create mobile accounts with the createmobileaccount tool
 * Fixes an issue that could allow a user to install pre-release software even when the setting is disabled

Security content
For detailed information about the security content of this update, see Apple security updates.