Achieving Full Microsoft Cloud Autonomy for a Multinational Utility Company

A British multinational electricity and gas utility organisation undergoing major corporate restructuring. As part of the divestiture, a new company needed to be carved out from a deeply integrated Microsoft 365 and Azure environment — with zero disruption to 3,000 daily users.

Challenge: A Complex Tenant Split with Zero Room for Downtime

The shared Microsoft cloud environment had evolved into a tightly interconnected ecosystem. Separating a new entity required precision, governance, and uninterrupted business operations.

Business Continuity at Stake
- 3,000 users required uninterrupted access to email, files, Teams, and business apps
- Identity changes and domain updates had to occur without workflow disruption
Complex Data Segregation Requirements
- Emails, files, Teams history, and collaboration artefacts needed precise extraction
- No data loss, corruption, or cross‑tenant exposure permitted
Identity & Access Redesign
- Authentication paths and domain routing required re‑architecture
- New governance and security baselines needed to be established
Application & Platform Dependencies
- Power Apps, Power Automate flows, connectors, and data sources required careful migration
- Planner plans and project data needed to remain intact
Strict Security & Compliance Obligations
- Sensitive data required controlled exit paths
- All transfers had to meet regulatory and organisational compliance standards

Solution: A Structured, Secure, and Business First Migration Approach

Simplex Services delivered a structured programme ensuring the new company became fully autonomous while maintaining operational continuity.

Structured, Phased Migration Strategy
- Planned and executed a full Microsoft 365 tenant separation
- Preserved historical email data and re‑established routing and authentication
Secure Data Separation & Governance
- Migrated filtering, archiving, and security policies from Proofpoint
- Implemented Egress for secure, compliant data transfer
Continuity of Collaboration & Productivity
- Migrated SharePoint sites, libraries, and OneDrive storage
- Re‑established Teams structures, channels, and chat history
Re‑established Identity & Access Controls
- Redesigned user accounts and authentication paths
- Implemented new governance and security policies across Microsoft 365
Application & Workflow Preservation
- Migrated Power Apps, flows, connectors, and data sources
- Re‑linked dependencies to avoid business process disruption
- Migrated Planner plans, tasks, and project data
Post‑Migration Stabilisation & Support
- Provided L3/L4 support during the transition
- Delivered documentation and knowledge base for independent operation

Outcome: A Stable, Independent, and Future Ready Cloud Environment

The engagement successfully delivered a clean separation of the new company from the utility provider’s shared Microsoft cloud environment — with minimal disruption and full continuity of business operations.

Full Tenant Autonomy
- A completely segregated Microsoft 365 and Azure environment
- Independent operations without reliance on the parent organisation
Zero Disruption for 3,000 Users
- Continuous access to email, files, Teams, and business apps throughout the transition
Secure & Compliant Migration
- Controlled data exit and secure handling of sensitive information
- Alignment with regulatory and organisational compliance frameworks
Business Process Continuity
- Power Platform apps and workflows migrated without breakage
- Planner and project data preserved end‑to‑end
Operational Stability
- Post‑migration support ensured a smooth transition
- Reduced long‑term dependency through documentation and knowledge transfer

Digital Workplace

Technology Stack

Microsoft 365: Exchange Online, SharePoint Online, OneDrive for Business, Microsoft Teams, Project Planner
Microsoft Azure: Azure Active Directory / Entra ID
Power Platform: Power Apps, Power Automate
Email Security: Proofpoint (filtering, archiving, policy migration)
Security & Compliance: Egress Secure Email & File Transfer
Migration Tools: Third‑party high‑fidelity migration tools

Achieving Full Microsoft Cloud Autonomy for a Multinational Utility Company

Challenge: A Complex Tenant Split with Zero Room for Downtime

Solution: A Structured, Secure, and Business First Migration Approach

Outcome: A Stable, Independent, and Future Ready Cloud Environment

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