AFAIK they use Open-Xchange, Univention Corporate Server and other specialized (maybe customized?) an open solutions for telephony, interoperability and other tasks.

https://euro-stack.com/blog/2025/3/schleswig-holstein-open-s...

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mapontosevenths a day ago | parent [-]

I've never used it. Does this actually replace AD and group policy effectively? Does it manage updates properly? Can it handle compliance tasks?

I've used other things that claimed to in the past and none came anywhere close in practice. They all turned out just to be LDAP with some NT4 style policies for windows and very little at all for the Linux clients. It was like traveling back in time to the Windows 2000 era of management.

	▲	Lapel2742 18 hours ago \| parent [-]
		> Does this actually replace AD and group policy effectively? I do not know. They probably evaluated the solution before they made the decision. In any case, continuing to use AD seems out of the question. Relying on US based software in 2025 and beyond is simply not a viable option for any administration that values its sovereignty. The US isn’t even hiding its hostility.