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If your goal is to get a fresh start, with no previously installed apps or settings, you can choose the<br />

Keep Personal Files Only option. That preserves any data files (including downloads) but otherwise<br />

creates a default Windows <strong>10</strong> installation. Choosing the last option, Nothing, is the equivalent of a clean<br />

install.<br />

Following that choice, setup runs through a series of operations and eventually ends up with the<br />

option to sign in to an account.<br />

In any of these upgrade scenarios, assuming the operation completed smoothly, the result is a device<br />

running the same Windows edition (Core, Pro, or Enterprise) as the pre-upgrade device. Data files,<br />

apps, and settings should be migrated completely if you chose to keep them.<br />

To perform a clean install, you need to boot from installation media (a USB flash drive or a DVD, or<br />

an ISO file in the case of a virtual machine). If you choose to format the destination drive, the process is<br />

destructive, wiping out all apps and data. If you choose an existing volume but don’t erase it, existing<br />

files are moved to a Windows.old folder, where they can be recovered in a pinch.<br />

Note Don’t delete the Windows.old folder unless you’re desperately in need of disk space.<br />

In Windows <strong>10</strong>, the existence of this folder allows you to roll back from Windows <strong>10</strong> to your<br />

previous Windows version from the Recovery option in the Settings app. (You can read more<br />

about this feature in Chapter 9, “Backup, recovery, and troubleshooting options.”) If you no<br />

longer need those files and want to reclaim the space they’re occupying, run the Windows<br />

Disk Cleanup utility (Cleanmgr.exe) as an administrator. Choose the Previous Windows<br />

Installation(s) option to remove the Windows.old folder and its contents permanently.<br />

Creating and managing user accounts<br />

In an upgrade, Windows <strong>10</strong> preserves your existing user profile and prompts you to sign in using the<br />

same credentials as on the upgraded device. On a clean install, you need to create the first account<br />

from scratch. In Windows <strong>10</strong>, you have three options:<br />

■■<br />

Microsoft account This is the default option for a personal device that isn’t joined to a domain.<br />

A Microsoft account (which is the direct descendant of the former Passport and Windows<br />

Live ID services) uses an email address and password to enable various cloud services. For<br />

Windows <strong>10</strong> devices, the most immediate benefits are the ability to purchase apps and digital<br />

content from the Windows Store and to sync settings and files (using OneDrive) between<br />

devices signed in with the same account. Depending on your network policy, you might be able<br />

to link a Microsoft account to a domain account so that a domain-joined machine can get the<br />

benefit of syncing settings.<br />

■ ■ Work account As an IT pro, you’re probably intimately familiar with domain accounts, which<br />

use Active Directory credentials to authenticate users and allow access to resources on a shared<br />

enterprise network. Windows <strong>10</strong> also includes the option to connect to an Azure Active Directory<br />

account, which allows access to cloud-based resources such as Office 365. Setting up a<br />

CHAPTER 3 Installation and activation 43

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