Run Microsoft 365 securely – keep identities, endpoints, data, and AI scenarios under control
ReByteIT helps small and medium-sized businesses assess existing Microsoft 365 configurations, improve them with focus, and implement measures when needed – with personal guidance from one direct contact instead of an anonymous agency structure.
Is your Microsoft 365 environment really configured securely?
Many companies use Microsoft 365 productively, but are not sure whether identities, endpoints, data, and new AI features are actually configured securely.
Insecure User and Admin Accounts
Missing MFA and legacy role assignments often go unnoticed.
Unclear Governance for Copilot and AI Agents
Permissions and data access are rarely reviewed before rollout.
Incomplete Protection for Devices, Email, and Data
Existing licenses do not automatically cover all risks.
Unused Features in Existing Licenses
Many security capabilities are licensed but not actively configured.
Microsoft Security from an End-to-End Perspective
A brief overview – detailed descriptions, assessment scopes, and FAQ are available on each individual service page.
From Assessment to Implementation
Assessment
Assess the existing Microsoft environment, configurations, and risks.
Implementation
Implement agreed measures in a controlled and documented way.
Optimization
Further develop existing settings and policies in a targeted way.
Continuous Improvement
Continuously evaluate new requirements and Microsoft features.
Sebastian Kerssen is Managing Director of ReByteIT and the direct contact for Microsoft Security, Microsoft 365, identities, and technical compliance topics – active in the Microsoft ecosystem since 2014. He personally supports companies in clearly classifying risks and planning meaningful next steps.
Learn More About Sebastian and ReByteIT →Specialized Expertise Without Unnecessary Complexity
One Direct Contact
Direct coordination without constantly changing responsibilities.
Clear Guidance
Technical topics are explained in a clear, practical way.
Practical Recommendations
Recommendations fit your environment and goals.
Clear Scope Boundaries
Service phases are separated transparently.
Which companies ReByteIT works with
Questions About ReByteIT and Microsoft Security
Does Microsoft 365 Automatically Mean We Are Secure?
No. Microsoft 365 offers many security features, but they must be actively configured. An assessment clarifies where identities, endpoints, and data are already protected and where action is needed.
Which Service Fits Our Current Situation?
This can be narrowed down in the initial consultation. If the current security status is unclear, a Microsoft Security Assessment is often the right structured starting point.
Can Individual Service Areas Be Commissioned Separately?
Yes. Assessment, Entra ID, Defender, Purview, Security Copilot, or CSP can be addressed individually or combined in a meaningful way depending on your goals.
Does ReByteIT Also Support Technical Implementation?
Yes. Implementation of recommended measures can be agreed separately after the assessment. Scope and responsibilities are defined transparently.
Which Companies Is ReByteIT the Right Partner For?
Especially for small and medium-sized businesses using Microsoft 365 that do not have an in-house security team and want one direct personal contact.
Is Microsoft CSP a Licensing Advisory Service?
No. We provide non-binding tips on license selection, but this does not replace formal advisory services. For a deeper assessment of your Microsoft 365 environment, an initial consultation is the right starting point.
What Microsoft security question is on your mind right now?
In a free initial consultation, we clarify your current situation and the most suitable next step.