Not only is one German state moving from Microsoft to LibreOffice, but the whole federal government is committing to move to open standards by 2027: https://blog.documentfoundation.org/blog/2025/04/29/germany-committing-to-odf-and-open-document-standards/
Germany committing to ODF and open document standards - The Document Foundation Blog

Digital sovereignty is of vital importance for data freedom. If governments and organisations use proprietary or pseudo-standard formats, they limit the tools that citizens can use to access data. So we’re happy to see that the IT Planning Council in Germany is committing to move to the Open Document Format – a fully standardised format […]

The Document Foundation Blog
@libreoffice Thanks. Can you also share a reference to the source document that contains this decision?
@bartknubben It's linked to in the blog post: "More information (in German) on this page."