UCS is the easiest way to have both an OpenLDAP for Linux/Unix clients and software and a Windows / Mac OS X focussed Active Directory based on Samba. To manage users and groups for various services and desktops UCS is a very good choice. In contrast to other preconfigured server distros, UCS has the ability to scale to several instances (like in a Microsoft Domain). The different additional software packages are also helpful, for example the good integration of OwnCloud/Nextcloud with Collabora or free groupware solutions like Kopano.
Regarding the licensing mentioned by other reviews: UCS itself is free and open source. There is a good community on help.univention.com, and as long as you are willing to discuss with the community or read the documentation (mostly HTML/PDF), you aren't forced to have a contract. On the other hand, there are some software packages in the addons / "App Center", that are not directly from Univention and not free.
UCS is not really free, you are mostly forced to purchase their expensive support plans...it's not a standard distro...furthermore is has some kind of obscure registry (yep like Microsoft) and a mix max of clustered config files....many bigger packages need optimization and the basic man pages do not help just because UCS uses their above mentioned system...
The standard documentation from UCS is written poorly and the offered youtube videos sound like something for non techs.
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