Your iPhone, iPad, or iPod touch may not always update when you read, delete, reply to, or move messages in MobileMe Mail, or in an email application on your Mac or PC.

When using a POP email account with multiple devices, email messages may only appear on the first device that receives them. This occurs when an email client is configured to automatically remove email from the server once an email client has received it. You can configure your email client (or clients) either to keep a [...]

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.

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.

When using iOS 4 or later, the Nike+ application does not offer an option for a calibration workout. Instead, you can calibrate at the end of any workout.

You can view and share files on your iDisk with the iDisk app for iPhone, iPad, and iPod touch. For help using the iDisk app, open the app, tap Settings in the upper-left corner, then Tap iDisk Help.
If you encounter issues while using the iDisk app, the steps below can help you troubleshoot further. iDisk [...]

This article describes ways to find your iPod serial number. The content of this document also applies to iPod shuffle; however, see iPod shuffle: How to find the serial number for information on how to locate iPod shuffle’s serial number on the device.

This article discusses the compatibility of the Apple Wireless Keyboard and third-party Bluetooth keyboards with iOS devices.

Learn why the storage capacity stated in a product’s specification may be lower than what is reported by Mac OS X or iOS.

You can enable Restrictions, also known as Parental Controls, on an iPhone, iPad, or iPod touch to prevent access to specific features. This article provides an overview of the types of Restrictions that are available, as well as how to enable or disable Restrictions on your device.