Hi Markus,
Welcome to post in our forum.
The purpose of the UCS is that to store a Lync enabled user’s contact in Exchange server instead of Lync server itself.
In SFB 2015, Unified contact store is enabled by default. You can enable or disable users for unified contact store globally, by site, by tenant, or by individuals or groups of individuals.
The following document is for your reference
https://technet.microsoft.com/en-us/library/dn986830.aspx
https://technet.microsoft.com/en-us/library/jj205283.aspx
https://thamaraw.com/2014/12/28/configuring-unified-contact-store-ucs-with-lync-server-2013/
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Regards,
Alice Wang
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