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My computer just downloaded an OS X update. Is it possible to know what's been changed?

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Apple provides support articles with a high-level overview of the changes in an operating system update. For example, here's the one for Mac OS X 10.6.5:

What's included?

General fixes and improvements

  • Improves reliability with Microsoft Exchange servers.
  • Addresses performance of some image-processing operations in iPhoto and Aperture.
  • Addresses stability and performance of graphics applications and games.
  • Resolves a delay between print jobs.
  • Addresses a printing issue for some HP printers connected to an AirPort Extreme.
  • Resolves an issue when dragging contacts from Address Book to iCal.
  • Addresses an issue in which dragging an item from a stack causes the Dock to not automatically hide.
  • Resolves an issue in which Wikipedia information may not display correctly in Dictionary.
  • Improves performance of MainStage on certain Macs.
  • Resolves spacing issues with OpenType fonts.
  • Improves reliability with some Bluetooth braille displays.
  • Resolves a VoiceOver issue when browsing some websites with Safari 5.
  • Improves Bluetooth pairing with Magic Trackpad.
  • Resolves performance issues with third-party displays that use InstaPort technology.
  • Add SSL support for transferring files with iDisk.
  • Resolves an issue when opening 4-up Photo Booth pictures in Preview.
  • Addresses keyboard responsiveness issues in the Dock when Spaces is turned on.
  • Resolves an issue syncing Address Book with Google.
  • Fixes an issue when replying to a Mail message sent by a person whose name contains certain characters such as é or ü.
  • Improves performance for users bound to an Active Directory domain.
  • Improves reliability of Ethernet connections.
  • Systems with a Mac Pro RAID Card (Early 2009) installed can now be put to sleep. For more information, see Mac Pro RAID Card (Early 2009): Enabling system sleep.
  • Improves reliability of fibre channel connections, resolving a potential Xsan volume availability issue.
  • Adds RAW image compatibility for additional digital cameras.
  • Security improvements; for information about the security content of this update, please visit this article.
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