Sellf for Mac OS X and Windows May 4, 2016 Sellf for Mac OS X and Windows Posted on May 4, 2016 in Share this article: Share this article: [fbcomments url="https://sellfapp.com/discover-sellf/keep-your-contacts-in-sync/attachment/sellf-for-mac-os-x-and-windows-3/" width="100%" count="off" num="5" countmsg=""]