Insight WebClient is a commercial webmail server, made by Bynari. It is compatible with their Insight Connector for the Courier IMAP server, a plugin that lets Microsoft Outlook™ use the Courier IMAP server in place of an Exchange server. WebClient provides web access, using any Linux or Mac browser, to your Outlook ™ data, like Outlook™ Web Access.
The WebClient is currently a beta release and available for a free 30-day evaluation/trial. Please contact Bynari for more information, and support.
(If you're looking for a free, non-commercial webmail software, try SqWebMail)
Errata - Corrections to Bynari's installation instructions:
−−keep parameter to their
extraction script.