Glenn FleishmanSenior Contributor, Macworld

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Glenn Fleishman is the author of dozens of books, including his newly released A Practical Guide to Networking, Privacy, and Security in iOS 10, a book that has information and step-by-step advice on connecting to and managing networks, and securing your data and your privacy. He's a senior contributor to Macworld, where he writes the Private I and Mac 911 columns and hosts the Macworld podcast, and contributes regularly to many periodicals.

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How to change your default font for viewing and composing in macOS Mail

It's easy to switch the default font in Mail—when it works.

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Where to find Safari’s downloads list

The downloads button plays hide-and-seek with Mac users.

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Your top questions to Mac 911—and some answers

Many people write in with similar problems. Here's a super-FAQ to help solve the most common iOS , iCloud, and Mac issues.

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The 10 must-have utilities for macOS Sierra

For the least frustration and most efficiency on your Mac, install these handy extras.

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How to open a disk image’s Library folder

A reader wants to access the Library folder that’s stored on a mounted disk image.

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Should you keep using an old Time Capsule to rotate for off-site storage?

A reader wonders about putting a former Time Capsule into a secondary position in her backup queue.

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Don’t delete your photos after turning on iCloud Photo Library

With iCloud Photo Library on, clearing storage space isn't a trivial task.

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How to capture deleted photos from an unsynced device

A reader wants to retain photos deleted from another device that remain on a synced iPad that’s been off all networks.

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Why Photos for macOS can’t find an imported image

A reader’s imported photos are marked as missing when deleted from their original location.

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How to downgrade your Mac to an older version of OS X using an external drive

A reader needs an older version to use Adobe software, but Mac 911 is reluctant to advise it.

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Pastebot 2 review: Mac utility combines a deep clipboard with clever conversions

A new utility has features for managing copied items found elsewhere combined with unique additions that help in a world of text.

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Podcast 538: Ermagherd ErrPerrrds

AirPods are finally out, Apple is pulling the battery-remaining estimate from macOS 10.12.2, the new emoji are uncannily beautiful, and the I'm a Mac ads are 10 years old.

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How to add a display to a Mac by using another Mac, iPad, or an HDTV

You’ve got options other than a standard display to use as your Mac's monitor.

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How to back up large files and collections off site

A reader wants to store 500GB somewhere other than on a local hard drive, and wonders about options.

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How to connect the Apple Cinema Display to the new MacBook Pro

Older Apple displays can't pass the necessary signal through a Thunderbolt 2–to–Thunderbolt 3 adapter, but Mini DisplayPort adapters are on the way.