Case Study: GroupM achieves $300K+ annual cost savings and a seamless global migration to Teams with Microsoft Power BI

Global media company cuts costs with Microsoft Teams

GroupM, a global media investment company with more than 39,000 employees, faced rising phone costs from widespread toll‑free dial‑ins and poor VoIP call quality while using Skype for Business Online. To address collaboration and cost issues the company moved to Microsoft Teams for chat, meetings, and conferencing, and used Microsoft Power BI to help quantify user behavior and build the business case for change.

To roll out Teams globally GroupM ran a multi‑wave migration (Islands mode, AppLocker control), built a network of 500+ regional champions and localized training, and used a Microsoft Power BI dashboard to show country CIOs who used Audio Conferencing and toll‑free dial‑ins. The result: more than 39,000 employees moved to Teams Only over four weekends with no post‑migration business‑day helpdesk tickets, clearer audio/video quality, and annual savings of over USD 300,000 after removing toll‑free numbers — insights driven and validated using Microsoft Power BI.

GroupM