I cannot talk freely a 100% but I can tell you; the need to move away from ANYTHING "US" made is now a well established goal in all top governments.
The search is on, less features or capabilities are accepted as well...
In this day and age Microsoft's identity service, for large orgs, is mostly un-replaceable (deliberately not irreplaceable). AD compatible providers worked there for a bit, but AAD is very pervasive now.
In addition the cloud services being offered by large providers (Fabric, etc) are nearly impossible to justify not having, when money is not a consideration.
Seriously?! ha-ha
This is great.
I really want this to happen but sadly have seen a LOT of govt and private companies trying to move to libreoffice (and OpenOffice and StarOffice before that). None really stuck. The office suite is hard to replace and none of the open source suites are a good enough alternative right now. I hope that changes.