I am looking for an alternative to Seafile or ownCloud that can be self hosted. It should offer a web interface and a client as an alternative.
I cannot use ownCloud because it is not optimized to be run on a Windows server.
I cannot use Seafile because it does not work over HTTP or HTTPs.
I do not want to use Dropbox or similar services.
It should support synchronization of the file system with a Windows client.
It can be open or closed source. Free or paid.
The most important requirement is that the server software can be installed on a Windows server.