Missing Feature of Zimbra

Hi guys,

a feature I am missing with Zimbra is a desktop (Windows) sync application for files in Briefcase.
Yes, there are some file sync applications with WebDAV backends. However, first of all they do not really work* and second they have no shell integration. I would prefer a similar interface as TortoiseSVN or Dropbox.
I don't know if this would be an interesting product for ZeXtras, since it is not part of the server side. But I would definitely like it.

Best regards
vinzenz

* They sync based on the last modified time, which is not preserved when uploading files over WebDAV. The sync state should store a tag instead.