@nygl YES!!! very doable.
#Nextcloud is the best replacement for Office 365. If you're in an organization you can run local hosting, contacts, shared documents, email, video confererencing, and a whole lot more. Nextcloud is easy to deploy on your own hardware and many hosting companies offer the option to install out of the box.
You can easily #Linux individual machines in the organization. My preferred recco for easy switching from MS is #ZorinOS because it allows you to fully imitate the MS desktop environment so people don't feel lost or like they don't know where their settings are.
Then for the MS office suite tools, #LibreOffice is so, so good. They'll remind you of how stable and capable MS Office tools were like, 15 years ago before they went all Cloud-centered. Does everything you want and nothing you don't want, and NO AI.
Most MS cloud infra can run on linux anyway so it's a question of moving from Windows Server (ugh) over to Ubuntu or Fedora (far better).
LMK If you want more help. And this is obv more about how the organization works and collaborates, as that is my specialty, but I am also happy to discuss other options and issues.
