Microsoft is adding a new opt-in defense for enterprises to block adware, which is often sneakily wrapped into free downloads.

Adware is often classified as a potentially unwanted application, or PUA, an industry term for applications that aren’t necessarily malware but could be a security or performance risk.

“These applications can increase the risk of your network being infected with malware, cause malware infections to be harder to identify among the noise, and can waste helpdesk, IT, and user time cleaning up the applications,” according to a Microsoft blog post.

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