M365 Compromised? Know What to Do Next.
Detection. Containment. Recovery. Step-by-step guides for IT teams facing active M365 incidents.
Breach Response & Recovery Guides
Active compromises demand speed and clarity. Our guides walk you through detection, containment, recovery, and remediation step by step.
IMMEDIATE RESPONSE
M365 Tenant Compromised? Your 24-Hour Recovery Checklist
The first 24 hours after discovering a breach are critical. This checklist covers immediate containment, evidence preservation, and the essential steps to lock down your tenant.
Read Article →Data Breach Response Checklist: Don't Miss These 25 Critical Steps
A 25-step checklist covering detection, containment, evidence collection, remediation, and validation. Use this to ensure nothing falls through the cracks.
Read Article →Is Your M365 Tenant Hacked? 18 Warning Signs (And What to Do Next)
Know the telltale signs of active compromise: unusual login patterns, suspicious rules, credential activity. Learn what each indicator means and when to escalate.
Read Article →RECOVERY & LEARNING
What to Do After a Data Breach: Small Business Response Playbook
Not all breaches are the same. This playbook guides you through notification, stakeholder communication, and recovery planning so you respond with confidence.
Read Article →M365 Breach FAQ: 12 Questions Every Small Business Owner Asks
Do I need to notify customers? How do I restore deleted data? Can attackers still have access? Get clear answers to the most common breach questions.
Read Article →How a Regional Accounting Firm Recovered from M365 Compromise in 3 Days
See how one firm detected unauthorized data access, coordinated with incident responders, and restored full tenant control. Timeline, findings, and lessons learned.
Read Article →About BreachShield365
A Microsoft 365 compromise is one of the highest-consequence security incidents a business can face. Attackers gain access to email, files, contacts, and calendar data — and they often stay hidden for months.
When you discover a breach, every hour matters. You need clear guidance on detection, containment, evidence preservation, and recovery. BreachShield365 exists to provide exactly that: actionable, step-by-step guidance so you can respond with confidence.
These guides cover the technical steps to secure your tenant after compromise, from detection through full recovery.
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