When using a POP email account with iPhone, iPad, or iPod touch, the Mail application will occasionally remove cached email messages from the following folders:
Sent
Drafts
Trash
Note: This only affects the local copies of messages stored on the device, it does not affect messages that are kept on the server.1
You can rent movies from iTunes and watch them with your Mac or Windows computer, iPhone, iPad, video-enabled iPod*, or on your TV using your Apple TV.
* Supported video-enabled iPod models are:
iPod touch, iPod touch (2nd generation), iPod touch (Late 2009), iPod nano (5th generation), iPod nano (4th generation), iPod nano (3rd generation), and iPod classic. See this document if you’re unsure which iPod model you have.
Playing rented movies on Apple TV requires an update to Apple TV software. For latest information, please visit http://www.apple.com/appletv/ .
You can rent movies from iTunes and watch them with your Mac or Windows computer, iPhone, iPad, video-enabled iPod*, or on your TV using your Apple TV. You can also rent movies directly on your Apple TV.
* Supported video-enabled iPod models are:
iPod touch, iPod touch (2nd generation), iPod touch (Late 2009), iPod nano (3rd generation), iPod nano (4th generation), iPod nano (5th generation), and iPod classic. See this document if you’re unsure which iPod model you have.
You can listen to audio podcasts or watch video podcasts streamed over the Internet from the iTunes Store on iPhone, iPad, or iPod touch. You can also download audio and video podcasts to iPhone, iPad, or iPod touch and those podcasts will be synced to your iTunes library when you connect the device to your computer. (Using the latest version of iTunes is recommended).
You may see the following message in iTunes when connecting an iPhone or iPod touch to your Windows computer or when trying to sync with your device:
"iTunes was unable to load data class information from sync services"
When syncing contacts, calendars, or notes from Microsoft Outlook, there can be issues that prevent syncing from completing as expected. Many of the issues can be resolved with the steps in these articles:
Troubleshooting iPhone and iPod touch contact and calendar syncing via USB on Windows
MobileMe: Troubleshooting Windows syncing
If you haven’t followed the steps in the appropriate article above please do so. This article provides additional steps that may allow you to sync or detemine why you are unable to sync.
When you sync your iPhone or iPod touch using iTunes, some of your content is backed up on your computer. You cannot edit this backup or sync it with other applications or services, or with non–iPhone OS devices.
This article outlines how to enable syncing in iTunes to transfer content between your device and computer. In addition to creating a backup, syncing with your computer allows you to manage contacts, calendars, and bookmarks on your computer. If you are already syncing your content with MobileMe on your computer or another iPhone, you can sync the data from MobileMe to your iPhone by following the steps in this article.
Learn more about backups.
While playing a song, iPod unexpectedly skips to the next song. Find out what you can do if your iPod unexpectedly skips while playing a song.
Pictures and screenshots taken with the iPhone are stored on the Camera Roll. When you sync or perform a restore, iTunes creates a backup the contents of your iPhone, including the Camera Roll. The more pictures or other multimedia files that are on the Camera Roll, the longer a backup or restore will take.
Improve backup and restore times by regularly importing the contents of your Camera Roll, and then sync that content back to the iPhone.
iPhone OS 3.1 or later offers the ability to view tethering data usage in Settings > General > Usage.