Another ebook store is forced to close its doors due to being financially unsustainable. Sad to see.
You can read all about it here:
http://www.tuaw.com/2014/06/24/readmill-is-closing-its-doors-on-july-1-2014-needs-picture/?ncid=rss_truncated And the original post by Readmill is here:
https://readmill.com/epilogue
Be sure to download all of your data before July 1st, afterwards the app will no longer be available, and possibly your data. Although they mention "for the next 3 months" so this is a bit unclear. Books are available for export in multiple formats.