Five Hundred is an enterprise solar O&M CMMS built natively on Microsoft 365. These solar O&M case studies document how solar operators across Europe have replaced disconnected tools — Word documents for field reports, Excel spreadsheets for maintenance scheduling, email chains for work order assignment — with a single platform that delivers real-time portfolio visibility, data sovereignty, and zero vendor lock-in.

Each solar O&M case study covers the full deployment context: the operational challenges the operator faced at scale, the Five Hundred modules deployed, the Microsoft 365 components used (SharePoint, Power Apps, Power Automate), and the quantified results achieved. Direct client testimony is included in every case study.

Five Hundred deploys inside the client’s own Microsoft 365 tenant — no recurring SaaS licence fees, no third-party cloud dependencies, and no data leaving the client’s environment. The CAPEX model makes total cost of ownership straightforward to model and approve, typically delivering a favourable comparison against equivalent SaaS platforms within 24 months of deployment.