This is O20, the Office365 alternative for Linux.
Note: O20 is no longer actively being developed, but a new (although still in heavy development) version of it called KO20 is now being developed in QtQuick. See https://snapcraft.io/ko20 and https://gitlab.com/abstractsoftware/ko20 for more information.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
Snap can be installed on elementary OS from the command line. Open Terminal from the Applications launcher and type the following:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.