Yes cowork is the first part of copilot 365 that's actually useful, to me too. It is however paid separately per token which means you need the expensive 30$ subscription and pay tokens on top of that.

If you just get cowork directly through claude you do get generous usage within their 20$ subscription.

I have to use it through Microsoft too because of their lobbying our company but I don't think they won any war. They're just reselling other people's stuff. The integration with office is alright but I don't really rely on that. In my personal life I avoid them.