Microsoft 365 Is Where Most Attacks Start. We Make Sure It Is Not the Way In.
Microsoft 365 Security Services
Business email compromise, phishing and account takeover overwhelmingly target Microsoft 365. We review your tenant configuration, identity controls and mail flow to close the gaps attackers rely on most.
- Certified Experts
- OSCP, CEH, CRTP & industry-certified testers.
- Real-World Approach
- Manual testing with real-world attack techniques.
- Actionable Reporting
- Detailed findings with clear risk ratings and remediation.
- Confidential & Secure
- Strict NDA, data protection & privacy practices.
// Microsoft 365 Security Services
Closing the Gaps Attackers Target First
Microsoft 365 is usually the first thing attackers probe, because a single compromised mailbox can open the door to your entire organisation. We review your tenant's identity controls, mail security and data protection settings, and identify exactly where a phishing email or a leaked password could turn into a full breach.
We work with UK businesses of every size, from small teams on Business Premium to enterprises running complex E5 licensing with Purview and Defender.
- A Clear View of Every Gap That Could Let an Attacker In
- Hardened Identity, Mail Flow and Data Loss Prevention
- A Tenant Measurably More Resistant to Phishing and Takeover
// Coverage
What Our Microsoft 365 Security Review Includes
Conditional Access and MFA
Review of conditional access policies, MFA enforcement and any legacy authentication still permitted.
Exchange Online Mail Flow
Assessment of anti-phishing configuration, transport rules and mail routing.
SharePoint, OneDrive and Teams Sharing
Review of external sharing policies and anonymous link settings across collaboration tools.
Data Loss Prevention and Sensitivity Labels
Assessment of DLP rules and label configuration against the personal data you actually hold.
Admin Roles and Privileged Access
Review of who holds administrative rights and what a compromised admin account could reach.
Audit Logging and Purview
Confirmation that tenant activity is logged and retained long enough to investigate an incident.
// Methodology
How the Engagement Works
- 01
Discovery Call
We agree your licensing, tenant setup and the priorities behind the review.
- 02
Read-Only Tenant Review
We review identity, mail flow and data protection settings from read-only access.
- 03
Detailed Assessment
We identify the misconfigurations that are genuinely exploitable, not just non-default.
- 04
Findings Walkthrough
We explain every finding to your IT team in plain language.
- 05
Remediation Support
We support the fixes, with optional ongoing tenant monitoring.
// Ready when you are
Put your microsoft 365 security services to the test.
// Impact
Why Microsoft 365 Security Cannot Wait
Business Email Compromise Is Costly
It remains one of the most financially damaging attack types UK organisations face.
// How We Secure Your Microsoft 365 Tenant
- Identity and conditional access review, including MFA enforcement and legacy authentication
- Mail flow and anti-phishing configuration review across Exchange Online Protection and Defender
- Data loss prevention and sharing policy audit across SharePoint, OneDrive and Teams
- Admin role and privileged access review to limit what a compromised account can reach
What you get
// Platforms and Frameworks We Work With
// Why Pluto Cyber Security
We Secure the Tenant Attackers Actually Target First
Most breaches we investigate start with Microsoft 365. That means we know exactly which settings matter and which ones are noise. We give you a focused, practical plan instead of a lengthy report full of low-priority findings.
Hands-On M365 Expertise
Deep, practical experience across Business Premium, E3 and E5 tenants.
Focus on What Stops Real Attacks
We prioritise the controls that actually block phishing and account takeover.
Cyber Essentials Aligned
Tenant configuration is a core focus area for Cyber Essentials and Cyber Essentials Plus.
Most reviews are completed within one to two weeks depending on tenant size and licensing.
// Related services
Explore Related Services.
Get started
Ready to Scope Your Microsoft 365 Security Services?
Tell us what you need tested. We reply with honest guidance and a fixed-scope quote, usually within one business day.