I don't know about Microsoft exchange, but if you want to send mail or notices to patrons, you can use google mail. It's quite easy with program Postfix on debian (or Ubuntu). More information about use google mail server is here: http://kohageek.pbworks.com/w/page/58731341/Configure%20gmail%20with%20postf... Thank Vimal for finding and sharing this guide!   Best regards! Nguyen Quoc Uy Admin http://dreamlib.vn & http://vietnamlib.net Phone: +79525768182