iTunes for Windows includes Device Sync Tests within iTunes Diagnostics. Device Sync Tests can assist you in troubleshooting an issue when trying to sync your iPhone, iPad, or iPod touch in iTunes. This can assist with issues around syncing contacts, calendars, mail accounts, bookmarks, and notes over USB on your computer.

See the frequently asked questions below to learn more about renting TV episodes from the iTunes Store.
Note: TV rentals are currently only available in the US.

Learn how to adjust graphics performance on your MacBook Pro (15-inch, Mid 2010) or MacBook Pro (17-inch, Mid 2010).

iWork Update 4 is recommended for iWork 9.0, 9.0.1, 9.0.2, and 9.0.3. It addresses issues in Keynote, Pages, and Numbers, and adds export compatibility to Pages for the standard ePub file format (for use with iBooks).

Since version 1.5, Aperture offers full-size previews of images that can be used with iLife '06 and iWork '06 or later. Here are some tips on getting the most out of this feature.

Some Xsan features are not supported when accessing a SAN volume running on Quantum StorNext metadata controllers.

If you're a MobileMe member, you can create up to five email aliases for better organization, for fun, or even to prevent unwanted email from being sent to your primary MobileMe email address.

Learn how to reset the PowerBook and iBook Power Manager. Resetting the power manager also resets date and time settings.

Multitasking is a feature of iOS 4 that allows applications to perform specific tasks in the background while you are using other applications. Multitasking in iOS 4 is supported on iPhone 4, iPhone 3GS, and iPod touch (3rd generation).

Once you have synced or paired the Apple TV to your PC to establish a syncing or streaming connection, iTunes may state "The Apple TV 'name' is not responding. Check that any firewall software running on this computer has been set to allow communication on port 3689."

iCal, iOS 4, and MobileMe all offer a Birthdays Calendar. This calendar is automatically generated from birthday information found in your Address Book contacts. Contacts whose first birthday is more than 77 years ago do not display when viewed in the Birthdays Calendar on an iOS Device, such as an iPhone, iPod touch, or iPad.  
The Birthdays Calendar can be synced via cable (USB) in iOS 4 or earlier versions. In iOS 4, the Birthday Calendar is available directly on the device, either from contacts stored on the iOS Device or synced with MobileMe. This issue occurs regardless of whether the Birthdays Calendar was created on the iOS Device or synced to it via MobileMe or iTunes.

Learn about the 64-bit kernel on Mac OS X and its default configuration on some Macintosh models.

Apple Photo Services gives you a variety of print sizes for your projects. See the tables below for the sizes offered in your area . 

When modifying an event from the web calendar, the option for Custom under the Repeat Menu may be dimmed ("grayed out").

After using Nike+ on your iPhone or iPod touch, you may be unable to switch between options for repeating songs in the iPod/Music application.

When running the 64-bit version of Microsoft Vista on a Mac Pro (Early 2008) and later, the FireWire port may seem slow or unresponsive.

Learn which conditions you need to meet to put your Mac Pro (Mid 2010) with a RAID Card (Early 2009) to sleep.

Learn about compatibility with the 64-bit kernel included with Mac OS X v10.6.

Learn which Macs can use the 64-bit kernel in Mac OS X v10.6 and which use it by default.

There are several ways to open the optical drive trays on Power Mac G5 or Mac Pro:

Learn about Magic Trackpad and Multi-Touch Trackpad Update 1.0, which features it includes, which Mac computers should apply the update, and how to install the update.

Apple takes precautions to safeguard your personal information against loss, theft, and misuse, as well as against unauthorized access, disclosure, alteration, and destruction. Apple online services, such as the MobileMe website, use Secure Sockets Layer (SSL) encryption on all web pages where personal information is collected. The following tips are things you can do to help further reduce the risk of theft or stolen identity.
Note: If you think your MobileMe account has been compromised, see this article.

In addition to regular cleaning of your computer and input devices (keyboards, trackpads, and mice), you may find it necessary to disinfect them.
When a single computer is being used by multiple people either in a home, school, or another setting you may wish to disinfect the parts of the computer that people come into contact with, such as the the keyboard, mouse, or trackpad.  This also applies to Magic Trackpad and other wireless input devices made by Apple.

This document describes the security content of iOS 4.0.2 Update for iPhone and iPod touch, which can be downloaded and installed using iTunes.
For the protection of our customers, Apple does not disclose, discuss, or confirm security issues until a full investigation has occurred and any necessary patches or releases are available. To learn more about Apple Product Security, see the Apple Product Security website.
For information about the Apple Product Security PGP Key, see "How to use the Apple Product Security PGP Key."
Where possible, CVE IDs are used to reference the vulnerabilities for further information.
To learn about other Security Updates, see "Apple Security Updates".

Learn how to set up your Apple Wireless Mouse.

This software updates Mac OS X Server v10.6, v10.6.1, v10.6.2, or v10.6.3 to v10.6.4.

When accessing the iTunes Store on Windows, your computer may restart or display a blue screen (Windows XP), or iTunes may quit unexpectedly (Windows Vista). You might also have issues opening iTunes if it is configured to open to the iTunes Store.

Learn where to locate the serial number on your Magic Trackpad.

See the frequently asked questions below to learn more about iBooks and the iBookstore.

Using iOS 4 or later, you can sync Notes over the air using MobileMe or an IMAP email account. This article explains certain sync behaviors and shows how to enable Notes syncing.

The pixel dimensions for some RAW images in your library may be slightly different after you upgrade to Aperture 3.

Learn which digital camera RAW files are supported by Mac OS X v10.6 Snow Leopard, or later. Many digital cameras offer options to save pictures in digital camera RAW format.

If you have issues with your iPhone, try these tips first.