Mac OS X 10.10.5 was an update to Mac OS X 10.10 released on August 13, 2015.
This update includes the following:
- Improves compatibility with certain email servers when using Mail
- Fixes an issue in Photos that prevented importing videos from GoPro cameras
- Fixes an issue in QuickTime Player that prevented playback of Windows Media files
For detailed information about the security content of this update, see Apple security updates.