Excel is without doubt the most frequently used tool by marketers to plan projects, actions or campaigns. And with the arrival of Office365, Microsoft offers a cloud-based marketing suite in which you can seamlessly combine Excel with Outlook, Sharepoint, OneDrive, Teams, Planner, Word and Powerpoint. You have all the tools you need to write your marketing strategy, plan, manage tasks, manage budgets, write briefings and monitor results. No wonder the IT department puts the heels in the sand when marketers want to get a marketing planning tool in-house. In this article I sketch the differences between Office365 and a specialized planning tool, but I also outline the complementarity between the two systems.