Nextcloud vs Open365 a chance or a missed opertunity?

It’s true that with their 1.0 release of COOL, things look better, but let’s not forget that COOL != CODE. DE stands for development edition. You need a support contract to run COOL.

From their FAQ on CODE

The point of CODE is not to be “production-ready”, but to be a complete form of early access upon which developers can build and get involved with contributing
…
It makes things easy for you to play with the latest unstable developments – of course at some risk of loosing your data, and with no strong upgrade or continuity guarantees

CODE also contains debug markers and is not portable, so this tells me that distros may not package it and that using a platform demo VM is the only option.

Still miles away from “Documents” and the fact that a supported option exists offers a great solution for enterprise customers.