M365 Tenant Migration: Parking Zurich AG Is Successfully Integrated Into the City of Zurich’s IT Infrastructure.

From a standalone Environment to an integrated IT Infrastructure.

As a result of organizational restructuring, Parking Zurich had to be fully migrated into the City of Zurich’s IT infrastructure. This made one thing clear: All existing Microsoft 365 services had to be transferred to the OIZ tenant – securely, seamlessly, and without disrupting end users. The primary challenge was not the volume of data itself, but the many technical and organizational dependencies involved. The project was further complicated by the lack of direct access to OIZ's ShareGate servers. All migration activities, log reviews, and issue analyses had to be coordinated through an external OIZ team, requiring precise communication, structured planning, and close collaboration across seven different organizations. All with a clear goal: to migrate all Parking Zurich services to the OIZ tenant, ensuring 100% data security and completing the migration without any production downtime. At the same time, all systems were to be seamlessly integrated into the City of Zurich’s IT governance framework.

Strategic Migration: 1.4 TB of Data, Zero Downtime, 100% Integrity.

Epic Fusion implemented a structured, multi-phase migration approach designed to ensure security, stability, and transparency throughout every stage of the project. In total, the migration included 119 Microsoft Teams, 28 OneDrive accounts, 29 SharePoint sites, three Power Apps, and one line-of-business application including a PnP Search Web Part, representing more than 1.4 TB of data.

First, a comprehensive proof of concept (PoC) was conducted to validate all scenarios and identify potential risks. Based on the PoC findings, a detailed migration plan was developed that addressed all dependencies. The migration itself took place in iterative steps with continuous testing and validation. The final cutover was completed smoothly, with no disruption to business operations and all systems fully operational immediately after go-live. Careful planning, clear communication among all stakeholders, intensive coordination, and regular consultations were crucial to the project’s success.

Clear Coordination as the Key to Success.

This project was characterized by a large number of interfaces and stakeholders. The complexity of the project lay in coordinating seven different organizations and the reliance on external entities at OIZ. Epic Fusion acted as the central project coordinator, ensuring that all migration activities, log reviews, and issue analyses were transparently planned, aligned, and executed. Regular checkpoint meetings with all stakeholders enabled continuous progress validation, rapid issue resolution, and effective decision-making throughout the project. The smoothly executed proof of concept was crucial, as it built trust early on, reduced risks, and laid a solid foundation for a successful production migration.