"You'll need a new app to open this windowsdefender link" appears when Windows cannot open the Windows Security app using the ...

Defender is 'usually sufficient,' it says in a blog post that might rile up the antivirus industry.

Microsoft explains if Windows 11 needs third-party antivirus in 2026 as Defender matches top tools and AI-driven threats ...

To address this, Microsoft has invested significant effort into Microsoft Defender (formerly Windows Defender), the antivirus ...