If Windows is not activated, the system will still run, but it will face multiple restrictions. 1. The personalization options are limited, and the background, color and theme cannot be changed, and the "Activate Windows" watermark is displayed; 2. Security updates are still available, but optional updates and long-term support are limited; 3. Some functions such as timeline, cloud synchronization, etc. are restricted, and enterprise version tools such as BitLocker are not available; 4. There are legal risks, and you may encounter problems with piracy and frequently receive activation reminders.

If you don't activate Windows, the system will still work for the most part, but you'll face a number of limitations and announcements. Microsoft allows a grace period for activation, but once that's over, you're in what's often called a “reduced functionality” state — meaning your experience is intended to push you towards activation.

1. Personalization Options Are Locked

One of the first things you'll notice is that personalization settings are disabled. You can't change your desk background, window colors, or themes. The system might also apply a plain black background as a reminder that your copy isn't activated.

• You'll see a watermark in the bottom-right corner of the screen saying "Activate Windows"
• Themes from the Microsoft Store won't apply
• Some visual tweaks and customization tools may stop working properly

This doesn't affect performance, but it makes the system feel less like your own.

2. Security Updates Still Come Through (Mostly)

Even with an unactivated copy of Windows, Microsoft continues to provide critical security updates . This is intentional — they want to keep the entire ecosystem safer, even if some users aren't running geneuine copies.

However:

• Optional updates and feature improvements may be restricted
• Future major updates might not be offered automatically
• You won't get support from Microsoft if something goes wrong

So while you're not completely exposed security-wise, long-term stability and support becomes uncertain.

3. Limited Access to Features and Customization

Over time, more features may become restricted. For example:

• Windows Update might stop offering optional updates
• Smart features like Timeline, Cloud Sync, and certain Cortana functions could be limited
• Some apps and services might check activation status before allowing full use

Also, if you're using a business version of Windows (like Pro or Enterprise), not activate could block access to tools like BitLocker or Remote Desktop.

4. Legal and Practical Risks

Using unactivated Windows might seem harmless at first, but there are real-world implications:

• It's technically against Microsoft's software license agreement
• Businesses risk legal issues if audited
• Unactivated systems are sometimes targeted by malware disguised as activation tools

And practically speaking, you'll always have reminders popping up to activate, which can be distracting during daily use.

In short, not activate Windows won't break your computer, but it limits usability, locks out customization, and leaves you on shaky ground legally and technically. It works fine for basic tasks at first, but the longer you go without activation, the more friction you'll run into.

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