Yes, but with limits. You’ll have access to most core features, but you’ll be locked out of "Personalization" settings, and you’ll be nudged by a persistent semi-transparent watermark in the corner of your screen.

If you don't activate, you cannot change your desktop wallpaper, accent colors, lock screen, or themes. Most of these settings will appear greyed out with a message saying, "You need to activate Windows before you can personalize your PC."

Directly? No. Activation doesn't boost your CPU or RAM. However, it ensures you receive driver updates through Windows Update, which can significantly improve system stability and performance in games or professional software.

The "Activate Windows" watermark sits in the bottom-right corner of the display. Unfortunately, it sits on the top layer of the UI, meaning it will show up in screenshots, screen recordings, and during presentations.

Yes. To join the Windows Insider Program and test upcoming features before the general public, your machine must be activated. Microsoft generally doesn't allow unactivated devices to receive "Beta" or "Dev" channel builds, as these versions are meant for licensed users to provide feedback.