User feedback over Ticket#2016070521000203. Windows 10 should be added to the domain join: https://docs.software-univention.de/handbuch-4.1.html#windows-domaenenbeitritt
Partner asked for official Windows 10 support in UCS for a new customer project.
(In reply to Benjamin Haberhauer from comment #1) > Partner asked for official Windows 10 support in UCS for a new customer > project. Windows 10 is supported. I'll adjust the documentation.
*** This bug has been marked as a duplicate of bug 40844 ***