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Note: This tool doesn’t work on macOS 10.14 and later. Known issues, changed functionality, and blocked or discontinued features.Automated troubleshooting toolsUse the following tools to resolve various Outlook for Mac issues. Address book not found in library on mac. See this page for more information and learn how to install the tools:. Check Outlook for Mac support tools article for more details.This tool repairs search issues in Outlook for Mac.

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Optimized Storage in macOS Sierra and later* can save space by storing your content in iCloud and making it available on demand. When storage space is needed, files, photos, movies, email attachments, and other files that you seldom use are stored in iCloud automatically. Each file stays right where you last saved it, and downloads when you open it. Files that you’ve used recently remain on your Mac, along with optimized versions of your photos.

* If you haven't yet upgraded to macOS Sierra or later, learn about other ways to free up storage space.

Mar 24, 2020  You repeatedly get a message that macOS needs to repair your Library to run applications. Turn on or restart your Mac, then immediately press and hold Command (⌘)-R to start up from macOS Recovery. Start a Discussion in Apple Support Communities. Aug 27, 2015  The ' Mac OS X needs to repair your Library to run applications. Type your password to allow this ' message was not happening in a guest account or in another test account that I created with Admin privileges so I deduced it had to be isolated to the permissions on the original user account. Jul 12, 2017  During the trial install, the Mac freezes and requires a hard shutdown. After restart, the user no longer has permissions to their entire home folder and they get a pop-up 'macOS needs to repair your library to run applications'; however their password doesn't work to complete that process.

The Your Mac Is Infected With Popup Adware Virus pop-up alert is a misleading advertising that created in order to force you into calling the fake Apple Support Service. If you keep receiving those 'Your Mac Is Infected With Popup Adware Virus' popups every time when you surf the World Wide Web with the FF. Mar 21, 2015  Common Macbook problems: How to stop kernel warnings from randomly shutting down my Mac. Mac: How To Fix A Kernel Panic / OS Upgrade Startup Boot. How to Fix a Mac not Booting up.

Find out how much storage is available on your Mac

Choose Apple menu  > About This Mac, then click Storage. This is an overview of available storage space on your Mac, as well as the space used by different categories of files:

Click the Manage button to open the Storage Management window, pictured below. (The Manage button is available only in macOS Sierra or later.)

Manage storage on your Mac

The Storage Management window offers recommendations for optimizing your storage. If some recommendations are already turned on, you will see fewer recommendations.

Store in iCloud

Click the Store in iCloud button, then choose from these options:

• Desktop and Documents. Store all files from these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files stored only in iCloud show a download icon , which you can double-click to download the original file. Learn more about this feature.
  
• Photos. Store all original, full-resolution photos and videos in iCloud Photos. When storage space is needed, only space-saving (optimized) versions of photos are kept on your Mac. To download the original photo or video, just open it.
  
• Messages. Store all messages and attachments in iCloud. When storage space is needed, only the messages and attachments you recently opened are kept on your Mac. Learn more about Messages in iCloud.

Storing files in iCloud uses the storage space in your iCloud storage plan. If you reach or exceed your iCloud storage limit, you can either buy more iCloud storage or make more iCloud storage available. iCloud storage starts at 50GB for $0.99 (USD) a month, and you can purchase additional storage directly from your Apple device. Learn more about prices in your region.

Optimize Storage

Click the Optimize button, then choose from these options.

• Automatically remove watched movies and TV shows. When storage space is needed, movies or TV shows that you purchased from the iTunes Store and already watched are removed from your Mac. Click the download icon next to a movie or TV show to download it again.
  
• Download only recent attachments. Mail automatically downloads only the attachments that you recently received. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.
  
• Don't automatically download attachments. Mail downloads an attachment only when you open the email or attachment, or save the attachment to your Mac.

Optimizing storage for movies, TV shows, and email attachments doesn't require iCloud storage space.

Empty Trash Automatically

Empty Trash Automatically permanently deletes files that have been in the Trash for more than 30 days.

Reduce Clutter

Reduce Clutter helps you to identify large files and files you might no longer need. Click the Review Files button, then choose any of the file categories in the sidebar, such as Applications, Documents, Music Creation, or Trash.

You can delete the files in some categories directly from this window. Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.

Learn how to redownload apps, music, movies, TV shows, and books.

Where to find the settings for each feature

The button for each recommendation in the Storage Management window affects one or more settings in other apps. You can also control those settings directly within each app.

• If you're using macOS Catalina, choose Apple menu  > System Preferences, click Apple ID, then select iCloud in the sidebar: Store in iCloud turns on the Optimize Mac Storage setting on the right. Then click Options next to iCloud Drive: Store in iCloud turns on the Desktop & Documents Folders setting. To turn off iCloud Drive entirely, deselect iCloud Drive.
  In macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, then click Options next to iCloud Drive. Store in iCloud turns on the Desktop & Documents Folders and Optimize Mac Storage settings.
• In Photos, choose Photos > Preferences, then click iCloud. Store in iCloud selects iCloud Photos and Optimize Mac Storage.
• In Messages, choose Messages > Preferences, then click iMessage. Store in iCloud selects Enable Messages in iCloud.

• If you're using macOS Catalina, open the Apple TV app, choose TV > Preferences from the menu bar, then click Files. Optimize Storage selects “Automatically delete watched movies and TV shows.”
  In macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar, then click Advanced. Optimize Storage selects “Automatically delete watched movies and TV shows.”
• In Mail, choose Mail > Preferences from the menu bar, then click Accounts. In the Account Information section on the right, Optimize Storage sets the Download Attachments menu to either Recent or None.

Empty Trash Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Trash Automatically selects “Remove items from the Trash after 30 days.”

Other ways that macOS helps automatically save space

With macOS Sierra or later, your Mac automatically takes these additional steps to save storage space:

• Detects duplicate downloads in Safari, keeping only the most recent version of the download
• Reminds you to delete used app installers
• Removes old fonts, languages, and dictionaries that aren't being used
• Clears caches, logs, and other unnecessary data when storage space is needed

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How to free up storage space manually

Even without using the Optimized Storage features of Sierra or later, you can take other steps to make more storage space available:

• Music, movies, and other media can use a lot of storage space. Learn how to delete music, movies, and TV shows from your device.
• Delete other files that you no longer need by moving them to the Trash, then emptying the Trash. The Downloads folder is good place to look for files that you might no longer need.
• Move files to an external storage device.
• Compress files.
• Delete unneeded email: In the Mail app, choose Mailbox > Erase Junk Mail. If you no longer need the email in your Trash mailbox, choose Mailbox > Erase Deleted Items.

Learn more

• When you duplicate a file on an APFS-formatted volume, that file doesn't use additional storage space on the volume. Deleting a duplicate file frees up only the space required by any data you might have added to the duplicate. If you no longer need any copies of the file, you can recover all of the storage space by deleting both the duplicate and the original file.
• If you're using a pro app and Optimize Mac Storage, learn how to make sure that your projects are always on your Mac and able to access their files.

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Your home folder contains many files and folders that apps on your Mac have permission to read or modify. If you use Get Info or other methods to change those permissions, you could experience issues such as these:

• Changes that you make in System Preferences aren't saved after you quit System Preferences.
• Changes that you make to the Dock aren't saved after you log out of your user account.
• Windows that were open the last time you logged out or quit an app (before you changed permissions) open again after you log in or open the app.
• You're asked for an administrator name and password when moving certain items in the home folder.
• You repeatedly get a message that macOS needs to repair your Library to run applications.
• When saving changes to an item, you get a message that the file is locked or you don't have permission to save.
• Preview, TextEdit, or other sandboxed apps unexpectedly quit when opened.
• You get an alert that the startup disk has no more space available for application memory.
• Activity Monitor shows that Safari or SafariDAVClient is using a large amount of system resources.
• Your Mac performs slowly.
• iTunes says that your device cannot be synced.
• Photos and videos that you import into Photos or iPhoto don't appear within the app, but do appear in Finder. Or your library needs to be updated or reselected each time you open Photos or iPhoto.

Reset permissions

Mac Os Needs To Repair Library Pop Up Box

If the issue started after changing the permissions of items in your home folder , use these steps to reset permissions.

1. Turn on or restart your Mac, then immediately press and hold Command (⌘)-R to start up from macOS Recovery.
2. You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
3. When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
4. Type repairHomePermissions in the Terminal window, then press Return. The Repair Home app opens.
5. Select your user account, click Next, then enter your administrator password. Click Next unlock the volume and begin resetting permissions on your home directory.
   
6. When done, click Exit to return to the macOS Utilities window.
7. Select Reinstall macOS, then click Continue and follow the onscreen instructions to reinstall macOS.
   

If the issue persists

If resetting permissions doesn't resolve the issue:

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1. Make sure that you have a backup of your Mac, then erase your startup disk.
2. When done, reinstall macOS.
3. After installation completes and your Mac restarts to the setup assistant, create a new user account using a different name than the one you were using before. Any difference in spelling is enough.
4. If you made a Time Machine backup, use Migration Assistant to restore all your files from the backup.