Microsoft today opened the preview of its Windows Defender Advanced Threat Protection (ATP) to all enterprise IT professionals after testing the service with an invite-only group of companies for the last several months.

ATP, like similar services from security-centric vendors — including Arbor Networks, FireEye and Symantec — means to detect ongoing attacks on corporate networks, then follow up to investigate the attack or breach and provide response recommendations.

Rather than serving strictly as an early-warning system, Microsoft’s ATP — again, like others of its ilk — will be most useful in post-breach scenarios as companies struggle to deal with the fall-out.

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