10.6
- Adds the ability to play 1080p HD movies and TV shows from the iTunes Store.
- Improvements for iTunes Match.
- Bug fixes.

10.5.3
- Adds support for syncing textbooks with iBooks 2.

10.5.2
- Includes several improvements for iTunes Match.
- Fixes an audio distortion problem when playing or importing certain CDs.

10.5.1
- Adds support for iTunes Match

10.5
* iTunes in the Cloud. iTunes now stores your music and TV purchases in iCloud and makes them available on your devices anywhere, any time, at no additional cost.
- Automatic Downloads. Purchase music from any device or computer and automatically download a copy to your PC and iOS devices.
- Download Previous Purchases. Download your past music, TV, app, and book purchases again, at no additional cost. Previous purchases may be unavailable if they are no longer on the iTunes Store.
* Sync with your iPhone, iPad, or iPod touch with iOS 5.
* Wi-Fi Syncing. Automatically sync your iPhone, iPad, or iPod touch with iTunes any time they're both on the same Wi-Fi network.
* No longer requires QuickTime to operate.

10.4
Adds support for Mac OS X Lion.
It now allows users to take advantage of the Full-Screen App capability.
Provides a number of important stability and performance improvements.

10.3.1
Fixes iOS device syncing bug that occurred to some users while syncing the device.

10.3
Automatic Downloads. Purchase music from any device or computer and automatically download a copy to your Mac and iOS devices.
Download Previous Purchases. Download your past music purchases again at no additional cost. Your purchases are available in the iTunes Store on your Mac or in the iTunes app on your iPhone, iPad, or iPod touch. Previous purchases may be unavailable if they are no longer on the iTunes Store.
Adds Books to the iTunes Store, where you can discover and buy your favorite books on your computer and automatically download them to iBooks on your iPhone, iPad, or iPod touch.
Support for iCloud service.

10.2
Adds support for iPad 2, and iOS 4.3. Improves Home Sharing, allowing browsing and playback of entire iTunes libraries on devices running iOS 4.3.

10.1.2
Improves stability and performance, and adds support for CDMA iPhone 4.

10.1.1
Addresses music video playback and sync issues. Fixes issues where iTunes unexpectedly quits when deleting a playlist with iTunes Sidebar displayed, and when connecting an iPod to a PowerPC Mac.

10.1
Bug fixes. Streaming to AirTunes speakers working again. Adds Twitter connectivity to Ping. Adds printing support and support for devices running iOS 4.2.

10.0.1
Replace Genius sidebar with Ping sidebar. Bug fixes. Restore recognition of iTunes Server found on NAS Server.

10.0
Adds new social networking layer named "Ping". Adds support for iPod shuffle 4G, iPod nano 6G, iPod touch 4G, and Apple TV (late 2010). Renamed AirTunes to AirPlay. Adds visual improvements to list view. Improves performance. Adds additional support for VoiceOver Kit for iPod. Break compatibility with iTunes Server found on many NAS. New application icon.