Is there an analogue of owncloud for windows server?

Question

Information Security

And it would be better if it was written in C#. And just do I think that the word cloud is overblown here, it used to be called a content management system. I need a WEB interface so that there is a normal document editor. Probably it could be some kind of CMS.
The question is still open.

Answer 1

OnlyOffice (formerly TeamLab Office)
www.onlyoffice.com/ru
Written in .NET, for Windows.

Answer 2

Interestingly on windows server 2003 it will be launched?
ps off. There was a link on the site, but compatibility is only from 2008, but this is a web application and has nothing to do with the operation of the OS.