Check your settings in iTunes and iCloud

You might see duplicate calendars if you have more than one method to keep iCloud calendars up to date across your devices. Apple provides two methods: iTunes and iCloud. It's possible to use both methods if you’re using iTunes 10, or iTunes 11.2 or later and OS X Mavericks v10.9.3 or later.

If you have iTunes 10 or iTunes 11.2 or later, check to see if iTunes is syncing calendars:

1. Connect your iOS device to your computer with the USB cable that came with it.
2. Locate your device in iTunes, then select the Info tab. When you select the Sync Calendars checkbox, then iTunes is set to sync your calendars.

Then check to see if iCloud is also updating your calendars: 

• iOS: Tap Settings > iCloud on your iOS device. If Calendars is selected, then iCloud is set to keep calendars up to date.
• OS X: Go to the Apple menu () > System Preferences and select iCloud. If the Calendars checkbox is selected, then iCloud is set to keep calendars up to date.
• Windows: Open iCloud for Windows. If the “Mail, Contacts, Calendars, and Tasks” checkbox is selected, then iCloud is set to keep calendars up to date. 

If iTunes and iCloud are both set to keep calendars up to date, consider turning off calendar syncing in iTunes. Then, only iCloud will update your calendars.

1. Connect your iOS device to your computer with a USB cable.
2. Locate your device in iTunes, then select the Info tab.
3. Deselect Sync Calendars. New calendars and events will appear only once.

If you want to keep using iTunes to update your calendars, turn off iCloud Calendar:

iOS

1. Tap Settings > iCloud on your iOS device.
2. Deselect Calendars.
3. When asked, tap Delete from My [device].

OS X

1. Choose Apple menu () > System Preferences, then click iCloud.
2. Deselect Calendars. On OS X Mountain Lion and Mavericks, when asked, click Delete from My [device].

Windows 

1. Open iCloud for Windows.
2. Deselect the checkbox for Mail, Contacts, Calendars, and Tasks. Then click Apply.

Follow the steps in the next section to hide or delete duplicate calendars. Your old calendars and events will still be duplicated, so you need to either hide or delete them.  

About the iTunes Library.itl file

This file is a database of the songs in your library and the playlists you've created. Some song-specific data is saved in this file. If you delete the file, iTunes creates a new, empty copy when you open the application, but any playlists, song ratings, comments, or other information is lost. The iTunes Library file is only used by iTunes, and is the only one backed up by Time Machine on OS X.

For iTunes for Mac versions 10.4 and earlier, the library file name was iTunes Library with no file extention.

New versions of iTunes sometimes include enhancements to the iTunes library. When you open the new version of iTunes, iTunes updates your existing library to the new format and places a copy of the old library in the Previous Libraries folder. After iTunes updates successfully to the latest version, you can delete the older iTunes Library files.

To make iTunes your default media player, use the Default Programs control panel:

1. Go to Start > Default Programs.
2. Click Set your default programs.
   

   

3. Select iTunes. Here, you can set iTunes as the default player for all supported file types, or you can choose which file types you want iTunes to open by default.
   
4. Click OK when you're finished.

You can have iTunes notify you when it's not the default media player:

1. Open iTunes.
2. Go to Edit > Preferences.
3. Click Advanced, then click General.
4. Click "Warn me if iTunes is not the default player for audio files."
5. Click OK.

When the notification is on, you'll see this message: "iTunes has detected that it is not the default player for audio files. Would you like to go to the Default Programs control panel to fix this?"

To remove this notification, deselect the "Warn me" option in iTunes preferences.

The first time you open the Mac App Store in OS X Yosemite, it checks for installed versions of these apps that came with your computer, or that you installed from a disc:

• iMovie '11
• Pages '09
• Numbers '09
• Keynote '09
• Apple Remote Desktop 3.x

When these apps are found, newer versions are listed in the Updates pane of the Mac App Store. After you sign in to the Mac App Store with your Apple ID, these apps are added to your account. You can then update to the newer versions of these apps available for your Mac.

If the list of updates doesn't display all of the app updates you expect, first install any updates that are listed, including OS X updates. Then check the Updates pane again to see if a newer version of the app you're looking for appears.

If you still don't see app updates listed, check your Spotlight preferences. From the menu bar at the top of your computer screen, choose  > System Preferences > Spotlight > Privacy. If your startup disk or Applications folder are in this list, the updated apps might not be available in the Updates pane.

If the apps installed on your computer are older than the versions listed above, you can purchase current versions of these apps from the Mac App Store.

Check iCloud status

iCloud status will help you to figure out if a song was purchased from the iTunes Store, matched, uploaded, or is ineligible for upload. Items might not be eligible for upload if:

• Your computer isn't authorized to play that item.
• The item wasn't purchased from the iTunes Store or was purchased using a different Apple ID. 

To see the iCloud status of your songs:

1. Open iTunes. Make sure that you're in the My Music window. If you're not, click on the Music icon in the upper-left corner, then click on My Music in the top-middle of the screen.
2. From the pop-up menu in the upper-right corner of the screen, select Songs.
3. In the same menu, click Show Columns.
4. Make sure that there is a check mark next to iCloud Status. If there's not, click on iCloud Status.
   A status button becomes visible next to songs.
   

If a song contains DRM and is no longer available to buy from the iTunes Store, the song is uploaded to iCloud and made available for download in protected DRM format. You will be required to authorize your computer or device for playback.

A song will not be uploaded to iCloud if the song contains DRM, was purchased using a different Apple ID, and could not be matched.

When you subscribe to or turn-on iTunes Match, your iOS device or computer will be associated to the Apple ID being used for iTunes Match. Learn more about how to associate a device or computer to an Apple ID.

You can manage your password preferences for the iTunes Store, App Store, and iBooks Store from your iOS device.

You have two password options to choose from with paid and in-app purchases:

• Always: When you make a purchase, you'll always be asked to enter your password, even if you're logged in with your Apple ID.
• Sometimes: When you make a purchase, you'll be asked to enter your password only every 15 minutes.

If you don't want to enter your password when downloading free songs or apps, choose Never. You can't completely turn off password protection for paid items.

If you have Touch ID turned on for iTunes Store and App Store purchases on your iOS device, you don't need to set your password preferences. Also, if you turn on Touch ID after you set your preferences, Touch ID will override your preferences.

Family Sharing makes it easy for up to six people in your family to share each other’s iTunes, iBooks, and App Store purchases without sharing accounts. Pay for family purchases with the same credit card and approve kids’ spending right from a parent’s device. And share photos, a family calendar, and more to help keep everyone connected.

You can use Family Sharing on your iPhone, iPad, or iPod touch with iOS 8, your Mac with OS X Yosemite and iTunes 12, or your PC with iCloud for Windows. To get started, one adult in your household—the family organizer—sets up Family Sharing, invites up to five additional family members, and agrees to pay for any iTunes, iBooks, and App Store purchases they initiate while part of the family group. Once family members join, the features of Family Sharing are set up on everyone’s devices automatically.