iTunes Store: How to rent TV Shows

You can rent TV Shows from the iTunes Store and watch them on your Mac or Windows computer, iPhone, or iPod touch.1
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Using MSCONFIG to troubleshoot conflicts in Windows XP

In Windows XP, some background processes can cause issues that may prevent applications such as iTunes and QuickTime Player from working correctly, opening, or even installing. Learn how you might resolve these conflicts by disabling some items using the System Configuration Utility (MSCONFIG).
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iOS 4: About multitasking

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).
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iPhone, iPad, or iPod touch: Windows displays a blue screen message or restarts when connecting your device

A message may appear on a blue screen when connecting your iPhone, iPad, or iPod touch to a Microsoft Windows computer. This can happen if your iOS device has saved photos that were taken with the built-in camera or were saved from Safari, Mail, or other apps. This issue can also occur due to a USB driver conflict with other devices connected to the computer.
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Well known TCP and UDP ports used by Apple software products

Learn more about TCP and UDP ports used by Apple products, such as Mac OS X, Mac OS X Server, AppleShare IP, Network Assistant, Apple Remote Desktop, Macintosh Manager, and MobileMe. Many of these are referred to as "well known" industry standard ports. Note: Mac OS X v10.5 and later includes the Application Firewall, which is different from a port-based firewall.
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iOS: Providing Apple with diagnostics and usage information

Apple asks customers to help improve the iOS by occasionally providing diagnostic and usage information. Apple collects this information anonymously. By default, opting in is a one-time decision. If you'd like to change your decision, you can reset warnings so that you will be asked again.
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iOS: Birthdays Calendar does not display Birthdays starting more than 77 Years ago

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.
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iOS 4: Unable to view message body preview or mail receives blank messages

After setting up an email account, you may find that Mail loads message titles but not the message body previews or that mail receives blank messages: With preview Without preview Blank message  
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Troubleshooting iPhone, iPad, and iPod touch accessories

If you are having issues with an iPhone, iPad, or iPod touch accessory, try the following troubleshooting steps:
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iOS: Unable to switch between song-repeat options in iPod/Music application after using Nike+

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.
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iPhone 4: Using FaceTime behind a firewall

For most Wi-Fi networks, FaceTime video calling will just work. If you are on a Wi-Fi network that is behind a firewall, see below.
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About the security content of the iOS 4.0.2 Update for iPhone and iPod touch

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".
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iOS 4: Missing text when viewing an email in Japanese

Occasionally, when viewing an email message written in Japanese that includes an attachment, you may not see the text of the message. The text does appear when previewing or replying to the message.
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iOS: Error message when trying to use a custom Access Point Name (APN)

When activating 3G service on an iOS device using a custom Access Point Name (APN), the error message "Could not activate cellular data network: PDP authentication failure" may appear.
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iPhone and iPod touch: Syncing Notes

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.
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How to back up your data and set up as a new device

You may want to restore your iPhone, iPad, or iPod touch and set it up as new to troubleshoot an issue. Take steps to preserve your data before restoring as new by following this article.
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iTunes: Photo sync creates iPod Photo Cache folder

When you use iTunes to sync photos to iPhone, iPad, or iPod, iTunes creates a folder called "iPod Photo Cache" in the top level of the folder you selected for your photos. Picking another folder to sync does not erase the previous iPod Photo Cache folder. Depending on how many photos are being synced, your hard drive could fill up.
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Troubleshooting iPhone hardware

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