Microsoft 365 Security Implementation
Identity and endpoint baselines, piloted on a scoped device group before the wave.
See the engagementView the Microsoft Marketplace listingMANAGED SECURITY
Turn Microsoft security signals into an owned response.
Show me the test, not the slide that says it was tested. Managed security here means Microsoft Defender and Microsoft Sentinel evidence leading to a triage decision. Containment happens under an authority you wrote down, and the evidence is filed the way your examiner expects.
01 Source02 Boundary03 Human decision04 Evidence
HOW IT WORKS
The control path in practice.
- Confirm signal coverage and alert ownership.
- Correlate evidence in Microsoft Defender XDR and Microsoft Sentinel.
- Present the proposed containment step for approval.
- Record the outcome and tune noisy detections.
WAYS TO START
The fixed engagements behind this page.
Security Copilot for SecOps
Put Microsoft Security Copilot on Microsoft Sentinel so analysts decide instead of transcribe.
See the engagementBuy through Microsoft Marketplaceiboss and Purview AI Data Security
Find which AI data paths iboss catches, which Purview catches and which neither does.
See the engagementTHE PROMISE
What does managed security under agreed authority mean?
Alerts are triaged, agents are governed and evidence is filed, under a written authority matrix that says who may disable an account at 2 a.m. and who gets told.
You have met the SOC that forwarded alerts and called it monitoring. This is the other model: Microsoft Defender XDR and Microsoft Sentinel evidence lead to a triage decision, the decision carries a named escalation path, and the containment step is the one you pre-approved, or the one a named person approves now.
THE MICROSOFT INSIGHT
What security tooling is already in your Microsoft 365 E5 license?
More than most teams have switched on, including Microsoft Security Copilot for eligible E5 and E7 customers.
Microsoft Security Copilot is included for eligible Microsoft 365 E5 and E7 customers; the rollout started November 18, 2025 and continues in phases. (Microsoft Learn, checked Oct 31, 2026)
Activate what the license already includes and the budget conversation is about operating it. Buy a parallel stack and the conversation is about paying twice.
THE METHOD
How does a signal become an accountable response?
Through four steps that are written down before the first alert: coverage, correlation, approval and record.
- Confirm signal coverage and alert ownership across identity, endpoint and cloud.
- Correlate evidence in Microsoft Defender XDR and Microsoft Sentinel into one triage decision.
- Present the proposed containment step to the approver the authority matrix names, or act under the authority it grants.
- Record the outcome, tune the noisy detection, and file the evidence your examiner expects.
THE AGENTS
Who watches the AI agents your business units are deploying?
The same service, because Microsoft Agent 365 brings agents into the Defender and Entra tooling the security team already runs.
Agents built with Copilot Studio, Microsoft Foundry and Agent Builder join Agent 365 automatically; agents from elsewhere join through registry sync. Each one gets an owner, an identity and a permission row, and the monthly review covers them beside the users.
Inventory the agents now and the first agent incident has an owner before it opens. Wait and the inventory is built during the incident.
THE FIRST RUNG
Where does a stretched security lead start?
With the free cloud security check, then the Agent 365 Identity and Security Assessment, then managed security under the authority you set in writing.
The assessment is read-only and scoped separately from the service. The service starts only after the authority matrix, the escalation policy and the evidence format are agreed with you and your compliance officer.
AFTER TWO WEEKS
What will be working after two weeks?
- Signal coverage across identity, endpoint and cloud is mapped, with the gaps named.
- Alert ownership and the authority matrix are drafted in your words and waiting for your signature.
- The evidence format your examiner expects is agreed and the first week of alerts has been triaged against it.
- You hold the service scope and its quote as a written decision.
The work is delivered remotely inside your own Microsoft tenant, wherever your business is, and on site only when the work needs it.
HONEST ABOUT LIMITS
What this does not do yet
It does not replace a Microsoft Sentinel workspace with a preview feature. ISOC in Microsoft Defender, in preview, brings SIEM capabilities into the Defender portal for eligible Microsoft 365 E5 and E7 customers without an active Microsoft Sentinel workspace, with 30 days of included retention for Defender data during this preview phase. (Microsoft Learn, checked Oct 31, 2026, preview) The work plans around the controls that are fully released today and notes the preview as a candidate for the next review, with Microsoft Sentinel in the Azure portal unsupported after March 31, 2027 already on the calendar.
It does not act outside the authority you granted: an action the matrix does not cover waits for a named person, even at 2 a.m.
It does not make a compliance attestation for you: the service files the evidence and your compliance officer owns the statement.
THE ONE THING TO REMEMBER
Alerts triaged, agents governed, evidence on file, under an authority you wrote down.
Said another way: you decide in advance who may act, so nobody decides alone at 2 a.m.
Said a third way: show the test, not the slide that says it was tested.
SHOW YOUR WORK
See the control path on a fictional bank.
A risky AI use alert gets an owner
The sample response names who reviews and who may act.
Coming
See every demonstrationDIRECT ANSWERS
Questions before you decide.
Who may disable an account at 2 a.m.?
Whoever the authority matrix names, and only for the actions it grants. The matrix is written with you before the service starts and is part of the evidence pack.
Do we need a Microsoft Sentinel workspace?
The work plans on what is generally available in your license today. ISOC in Microsoft Defender is in preview and is reviewed as a candidate; Microsoft Sentinel in the Azure portal is unsupported after March 31, 2027.
Does the service cover AI agents?
Yes. Agents inventoried in Microsoft Agent 365 get an owner, an identity and a permission row, and are reviewed monthly beside users and devices.
What evidence do we receive?
A monthly pack in the format your examiner expects: alerts triaged, actions taken under which authority, escalations, tuning changes, and open decisions that need you.
How is it priced?
Quoted after a scoping call. The assessment is scoped separately from the service, and the service starts only after the authority matrix is signed.
NEXT STEP
Start with a boundary you can explain.
Choose a focused check, or speak with the team about the workflow you need to improve.