Don't-Miss Mac Stories

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Installing OS X: What to do when ‘this copy of the install OS X application cannot be verified’

If you encounter an error when trying to install a fresh operating system, it could be a problem with the date and time.

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How to erase a Mac that seems to lack erasure options

A reader wants to wipe her Mac before getting rid of it, but she doesn't see a clear way to do so.

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How to create a bootable macOS Sierra installer drive

Instructions for making an external drive that you can use to install macOS Sierra.

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How to configure a software RAID in macOS Sierra’s Disk Utility

The ability to set up a software RAID has returned to Apple's utility.

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How to deconstruct a software RAID made with macOS Sierra’s Disk Utility

If you created a RAID using Disk Utility and now you don’t want to use the disks as a RAID anymore, here’s how to delete the RAID.

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iTunes U: Free education to make you smarter

You've probably noticed it in the pop-up menu of the iTunes Store, but have you ever clicked on the iTunes U? If not, join the millions of people and expand your knowledge, for free.

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Starting up from NetBoot and NetRestore images

Step-by-step instructions on how to use the NetInstall service.

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How to fix missing media items in the sidebar

A reader lacks Photos, iTunes, and Movies items in the Open dialog.

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How to run apps that are not from the App Store in macOS Sierra

Apple made a major change to the Security & Privacy settings that affects new software you want to run.

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How to create NetBoot and NetInstall images

The latest in our series on using the NetInstall service.

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How to consolidate calendar events among multiple people

A reader wants to avoid duplicates after sharing calendars with colleagues.

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How to fix a long pause with a black startup screen in OS X

A reader has a 45-second pause when he restarts his Mac. During that meditative period, he wonders: why?

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How to use the Tabs feature in macOS Sierra

Tabs will help clean up your windows and make it easier to find what you need.

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How to use Picture in Picture in macOS Sierra

Watch video while you're working on your Mac.

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How to use Feedback Assistant to report bugs in the betas of macOS Sierra and iOS 10

Using the public betas? Do your duty and report bugs to Apple.