Overview
As part of its commitment to protect critical infrastructure systems and meet strict government compliance obligations, a major Australian water utility engaged Arinco to deliver a comprehensive security uplift. The transition from Microsoft 365 E3 to E5 introduced advanced security features across the organisation’s environment, supporting more than 1,000 users. Arinco implemented Microsoft Defender and Purview to deliver advanced threat protection, identity security and data governance. Alongside the technical implementation, Arinco provided program and change management expertise to support adoption, manage risk and minimise disruption. The engagement successfully addressed a significant number of audit findings, aligned the environment with key frameworks and established a roadmap for future security maturity.
Business challenge
The organisation faced growing pressure to meet complex and evolving cybersecurity compliance requirements, including state regulatory requirements and security frameworks.
Operating within a Microsoft 365 E3 environment, the organisation lacked the advanced security capabilities needed to meet these obligations. Fragmented security controls, limited visibility and licensing challenges made it difficult to protect sensitive data, enforce secure access and prepare for future technologies such as Microsoft Copilot.
With a user base of over 1,000 employees relying on these systems daily, there was a clear need for a seamless and scalable security uplift that would not disrupt operations. In addition, a number of audit findings highlighted the need for a comprehensive approach to strengthen security posture and establish a compliant foundation for future transformation.
Solution
Arinco delivered a comprehensive cybersecurity uplift, combining technical implementation with structured program and change management to meet compliance requirements while supporting a large, distributed workforce.
Implementing advanced security technologies
Arinco led the implementation of Microsoft 365 E5 security capabilities, including Microsoft Defender for Endpoint, Microsoft Intune and Defender for Identity, to enhance threat detection, device security and identity protection.
Microsoft Purview was implemented to enable enterprise-wide data classification and labelling, supporting compliance with data protection regulations and frameworks. Identity governance was strengthened through conditional access, multi-factor authentication (MFA) and privileged identity management (PIM), ensuring that sensitive systems were accessible only to authorised users.
These capabilities were integrated with existing systems to maintain operational continuity while significantly improving protection against evolving cyber threats.
Managing change and ensuring adoption
Arinco provided end-to-end program and change management support to ensure successful adoption of the new security capabilities.
This included structured discovery and pilot phases to validate the solution design and confirm alignment with compliance requirements. Arinco coordinated the rollout of Microsoft Defender and Purview components, developed change management plans and supported staff through the transition.
Change strategies focused on user awareness, feedback loops and policy education to embed secure behaviours into everyday operations.
To deliver the program effectively, Arinco adopted a hybrid delivery model, combining Waterfall for upfront planning and design with Agile methodologies for iterative implementation and continuous stakeholder engagement.
Together, these initiatives delivered a secure, compliant and scalable Microsoft 365 environment that addressed immediate risks while supporting long-term security maturity.
Outcomes
The Microsoft 365 E5 uplift delivered significant improvements in security, compliance and operational resilience across the organisation.
Key outcomes include:
- Resolved audit findings: Addressed outstanding security issues, strengthening regulatory compliance and reducing risk
- Scaled security uplift: Delivered enhanced protection and controls across more than 1,000 users with minimal disruption.
- Enhanced data protection: Enabled enterprise-wide data classification and strengthened identity and access controls.
- Improved threat resilience: Increased protection across endpoints, cloud applications and communication platforms.
- Established security roadmap: Defined a clear path for continued investment in identity, device management, threat protection and data governance.
- Prepared for future technologies: Created a secure foundation for technologies like Microsoft Copilot.
- Effective program delivery: Delivered a coordinated and timely rollout of Microsoft Defender and Purview aligned to compliance frameworks.
- Successful user adoption: Supported smooth onboarding to new security processes with minimal disruption, underpinned by structured change management and stakeholder engagement.
- Stronger security culture: Embedded secure behaviours through ongoing stakeholder engagement, education and alignment to compliance requirements.
- Improved Microsoft Secure Score: Increased Microsoft Secure Score to align with regulatory benchmarks.
