Yes, Microsoft Defender Antivirus will still protect your laptop if you do not renew your Microsoft 365 Personal subscription. [1]
The Difference Between the Security Tools
It is common to confuse the two, but Microsoft provides two different tiers of security: [2]
- Windows Security (Built-in & Free): This is the core, built-in antivirus software included with Windows 10 and Windows 11. It operates completely independently of any subscription and will continue to run, scan, and receive security intelligence updates for free. [1, 3, 4]
- Microsoft Defender App (Subscription-only): This is a premium cross-platform app included with Microsoft 365 Personal. If your subscription expires, you will only lose access to this specific app's premium features, such as the centralized security dashboard, identity theft monitoring, and protection for additional devices (like Mac, iOS, or Android). [1, 2, 5]
What Else Changes When Your Subscription Expires?
If you let your subscription lapse in October 2026, your device remains protected against malware, but your Office ecosystem will change: [1, 6]
- Office Apps Go Read-Only: Word, Excel, and PowerPoint will eventually enter a reduced-functionality mode. You can open and view files, but you cannot edit or create new ones. [6, 7, 8, 9]
- OneDrive Storage Shrinks: Your cloud storage will drop from 1 TB back down to the free 5 GB limit. If you are over the limit, you will eventually lose the ability to sync or upload new files. [6, 7, 10, 11, 12]
If you plan to let the subscription expire, make sure to download and back up any files from your OneDrive that exceed the free 5 GB limit before October 2026. [6, 7, 13]
If you'd like, I can show you how to check your current OneDrive storage usage or recommend free document editing alternatives.
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