My friends built something similar - NiceReply http://nicereply.com/ http://nicereply.com/ It was originally custom built in their webhosting company, but now

My friends built something similar - NiceReply http://nicereply.com/ http://nicereply.com/ It was originally custom built in their webhosting company, but now they've created a standalone product out of it. NiceReply has API, so you can integrate it in any CRM you're already using. It's really cool, check it out.