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Apple today seeded the third beta of OS X 10.10.4 to developers



From MacRumors:
The beta, build 14E17e, can be downloaded through the Software Update mechanism in the Mac App Store or through the Mac Developer Center. Apple is asking developers to focus on Photos, Migration, and Arabic and Hebrew languages.
  Apple Seeds Third OS X 10.10.4 Yosemite Beta to Developers and Public Beta Testers