--- title: Suez Case Study | Energy Sector description: Discover how the Suez Group reduced shared data exposure in M365 with the IDECSI solution ! image: https://blog.idecsi.com/hubfs/SUEZ.png --- [![Logo-Idecsi-Black-tagline](https://blog.idecsi.com/hs-fs/hubfs/LOGOS%20IDECSI/LOGOS%20OFFICIELS/Logo-Idecsi-Black-tagline.png?width=1010&height=319&name=Logo-Idecsi-Black-tagline.png)](https://www.idecsi.com/) - Solutions DETOX® pour M365 Audit, Remediation & ROI [Discover DETOX](https://info.idecsi.com/detox-m365?hsLang=en) ![Audit, Remediation & ROI](https://blog.idecsi.com/hubfs/ILLU-4.png) Solutions IDECSI gives security and IT teams full control over their data — across DSPM, Data Access Governance, Human Risk Management, and Data Volume Management. - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) M365 Data Security Platform](https://www.idecsi.com/solution/mydatasecurity/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Data storage optimization](https://www.idecsi.com/solution/mydatamanagement/) - Challenges M365 Checklist 15 Warning Signs Your M365 Data Is at Risk [Get the checklist](https://info.idecsi.com/checklist-15-warningsigns?hsLang=en) ![Checklist risques M365](https://blog.idecsi.com/hubfs/Frame-2147255341.png) Your 2026 Challenges Address your most critical data security and governance challenges - across your M365 environment - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Gain visibility accross M365](https://www.idecsi.com/challenges/visibility-microsoft-365) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Get Ready For Copilot M365](https://www.idecsi.com/challenges/m365-copilot/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Control external user access](https://www.idecsi.com/challenges/external-access-microsoft-365/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Prevent Sensitive Data Exposure](https://www.idecsi.com/challenges/sensitive-data-m365/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Gain visibility across Microsoft 365](https://www.idecsi.com/challenges/visibility-microsoft-365/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Ensure regulatory compliance](https://www.idecsi.com/challenges/compliance-m365/) - Resources Is Your Tenant Ready for Copilot? A Security & Governance Playbook [Download](https://info.idecsi.com/whitepapper_copilot?hsLang=en) ![Copilot guide](https://blog.idecsi.com/hubfs/Frame-2147255339.png) Our resources Check out our useful resources for improving data protection - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Blog](https://blog.idecsi.com?hsLang=en) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Help Center](https://help.idecsi.com/) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) Ressources & News](https://blog.idecsi.com/resources?hsLang=en) - [![download\_done](https://blog.idecsi.com/hubfs/download_done.svg) About us](https://www.idecsi.com/about-us/) - [Customers](https://blog.idecsi.com/resources-customer) - - [English](https://blog.idecsi.com/resources-customer/idecsi-case-study-suez) - [Français](https://blog.idecsi.com/fr/ressources-clients/cas-client-suez-secteur-gestion-de-leau) Search [Request a demo](https://info.idecsi.com/demo-idecsi?hsLang=en) Case-Study 21 May 2026 # Suez: Reducing Overexposure Risk and Data Volume on Microsoft 365 ![](https://4272098.fs1.hubspotusercontent-na1.net/hubfs/4272098/SUEZ.png) - [Home](https://www.idecsi.com/) - [Resources](https://blog.idecsi.com/resources?hsLang=en) - Suez: Reducing Overexposure Risk and Data Volume on Microsoft 365 ## **Reducing Overexposure Risk and Data Volume on Microsoft 365** ## **Context:** With over 28,000 users, SUEZ operates in an environment where data flows constantly between employees, external partners, and local authorities. Collaboration is at the heart of the group's performance, but it also comes with continuous storage growth (+10% every 6 months) and an increased risk of data overexposure. Faced with this situation, SUEZ sought to regain control over its Microsoft 365 environment and reduce its data exposure surface while empowering users to take responsibility. ## **Challenges:** To address these challenges, SUEZ implemented a structured governance program built around five key pillars, leveraging IDECSI's DETOX solution. The initiative aimed to: - **Reduce unnecessary storage and eliminate redundant file versions** — freeing up over 110 TB within just a few weeks. - **Strengthen access security** through user-driven rights reviews and the removal of critical sharing links. - **Raise employee awareness** through targeted communication over a four-week period. - **Classify and better manage sensitive data** using Microsoft Purview. - **Govern external collaboration** to ensure lasting security. In just 3 months, the group achieved tangible results: reduced storage costs, improved security, and the adoption of new governance rules across Teams and SharePoint. ####  *"With the DETOX solution, we achieved our financial objective by removing 110 TB, a major win to tackle M365 storage growth while strengthening data security." * *![Robin Foucault (Site)](https://blog.idecsi.com/hs-fs/hubfs/Robin%20Foucault%20(Site).png?width=128&height=128&name=Robin%20Foucault%20(Site).png)*    **Robin Foucault**,  Security Project Manager        Best practices to improve Microsoft Teams security [![Download the infographic ](https://no-cache.hubspot.com/cta/default/4272098/825ad7d1-e961-4a7a-a6b3-6e380b22285f.png)](https://cta-redirect.hubspot.com/cta/redirect/4272098/825ad7d1-e961-4a7a-a6b3-6e380b22285f) Subscribe to our newsletter and receive new contents every month Our case studies These resources may interest you ![Cas client Rocher ](https://4272098.fs1.hubspotusercontent-na1.net/hubfs/4272098/Groupe%20rocher.png) Case-Study Groupe Rocher: Data Protection in M365 & Carbon Footprint Reduction [Read the case study](https://blog.idecsi.com/resources-customer/idecsi-case-study-group-rocher?hsLang=en) ![](https://4272098.fs1.hubspotusercontent-na1.net/hubfs/4272098/Lactalis.png) Case-Study Lactalis: Identifying and Eliminating Non-Compliant Sharing and Access to Reduce Risk [Read the case study](https://blog.idecsi.com/resources-customer/idecsi-case-study-lactalis?hsLang=en) ![Cas client BPCE ](https://4272098.fs1.hubspotusercontent-na1.net/hubfs/4272098/BPCE-1.png) Case-Study BPCE: Protection and Control of Shared Data on Microsoft 365 [Read the case study](https://blog.idecsi.com/resources-customer/idecsi-case-study-bpce-it?hsLang=en) ### Data protection, let's discuss your project?   [![Contact us](https://no-cache.hubspot.com/cta/default/4272098/bea4f372-c84f-4ec4-980c-ca663747fbfe.png)](https://cta-redirect.hubspot.com/cta/redirect/4272098/bea4f372-c84f-4ec4-980c-ca663747fbfe) ![video background](https://idecsi2a-dev-idecsi.pf27.wpserveur.net/wp-content/uploads/2022/02/video-background-idecsi-responsive-1.png) [![Logo-Idecsi-White-Ss-ES](https://blog.idecsi.com/hubfs/LOGOS%20IDECSI/LOGOS%20OFFICIELS/Logo-Idecsi-White-Ss-ES.svg)](https://www.idecsi.com/) +33 1 84 79 38 30 - - - - [Why choose IDECSI?](https://www.idecsi.com/user-security/) - [About us](https://www.idecsi.com/about-us/) - [Join the team](https://www.welcometothejungle.com/fr/companies/idecsi) - Solutions - [Visibility](https://www.idecsi.com/challenge-data-visibility/) - [Detection](https://www.idecsi.com/challenge-threat-detection/) - [User engagement](https://www.idecsi.com/challenge-involve-user/) - [Access review](https://www.idecsi.com/challenge-rights-review/) - [Remediation](https://www.idecsi.com/challenge-remediation/) - [Sensitive data](https://www.idecsi.com/challenge-sensitive-data/) - [Products](https://www.idecsi.com/solution/) - [MyDataSecurity](https://www.idecsi.com/solution/mydatasecurity/) - [Advanced Monitoring](https://www.idecsi.com/solution/advanced-monitoring/) - [MyDataManagement](https://www.idecsi.com/solution/mydatamanagement/) - Resources - [Resources & News](https://blog.idecsi.com/resources?hsLang=en) - [Blog](https://blog.idecsi.com?hsLang=en) - [Customer success](https://blog.idecsi.com/resources-customer) - [Extranet](https://extranet.idecsi.com?hsLang=en) © IDECSI