Microsoft made quite a few announcements at their first Xbox & Bethesda Games Showcase at E3 2021.

Microsoft made quite a few announcements at their first Xbox & Bethesda Games Showcase at E3 2021.
Bethesda made a couple of announcements and teases at their E3 2019 showcase.
Microsoft made a couple of announcements on their episode of Inside Xbox at gamescom 2018.
Bethesda made a couple of announcements and teases at their E3 2018 showcase.