Open WebMail Project
http://www.openwebmail.org/

Open WebMail is a webmail system based on the Neomail version 1.14 from Ernie Miller. Open WebMail is designed to manage very large mail folder files in a memory efficient way. It also provides a range of features to help users migrate smoothly from Microsoft Outlook to Open WebMail. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.