Earlier quoted context omitted.
Suggesting libreoffice as an alternative to Office 365 is crazy.
Why? What feature does office 365 have that is so difficult to replace? I'm guessing support but... is there something more obvious? Full disclosure, I haven't used microsoft office in a few decades.
Not to mention, the data guarantees around Copilot are super enterprise compatible. Its not that companies want copilot, its that they know if they don't provide a solution, users will desire path into something with dodgy data security. So they provide "The Best" in the IBM sense of protecting the business and their jobs, which is Copilot.
It takes a bit of doing but your end state is, user logs into PC, signs in SSO, they get all their apps (remote and local), their emails, their documents, their collab and neither they or you need to think about it.
Oh and to continue, theres the whole Purview suite which is purpose built to integrate into large business data security incidents. I know of MSPs who wont be seen without Exchanges litigation hold / related tools because they have been saved from prosecution. Defender has not just grown more tentacles its like 3 different complete octopi at this point. Defender for Endpoint is particularly difficult to get away from because it does so damn much in the way of logging and monitoring for very little standup cost.
If you sat down most large orgs and created a list of what they may need to replace if they were getting rid of Office365 + supporting/supported features you would probably find its a lot more work. They are everywhere. Theres a turnkey(ish) microsoft solution that grows out the side of 365s head for every big business problem.
Intune. Hello. Man it just keeps going on.