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Insight Connector for Courier-IMAP is a commercial plugin for Microsoft Outlook™ that allows native Outlook groupware capabilities using Courier-IMAP. Outlook users can perform tasks typically available only when using the Exchange server, including folder sharing. Some of the features include folder sharing, public folders sharing, appointments/tasks scheduling, real-time data management, calendar sharing and other collaborative tasks.
A trial version of Connector can be downloaded from http://courier.bynari.net. This software is supported by Bynari.
Insight WebClient is a commercial webmail server, made by Bynari. It is compatible with their Insight Connector for Courier-IMAP, a plugin that lets Microsoft Outlook™ use Courier-IMAP 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)
Using Postfix with Courier-IMAP
The book Postfix talks about configuring the Postfix mail server to deliver to Maildirs, for Courier-IMAP.
Step-by-step instructions w/ screenshots for getting Mozilla 1.2.1, Outlook 2000, and Outlook Express 6 to work with Courier-IMAP.
Courier-IMAP + Maildrop + QMail with Virtual Domains HOWTO - self explanatory.
Install and Test Qmail with POP, IMAP and WebMail - a step by step tutorial on setting up a turn-key mail server.
http://www.gallowglass.org - how to setup your own private CA and then generate signed SSL certs for POP and IMAP over SSL.
Qmail FreeBSD toaster - another step by step tutorial, this one is based on FreeBSD.
Qmail VMailMgr and Courier-IMAP HOWTO - extensive documentation on integrating Courier-IMAP with the Qmail mail server and the VMailMgr virtual domain manager.
A patch to use DRAC with Courier-IMAP is available at http://aelyn.hell-city.org/courier-imap-popd-drac.patch.
SecurityFocus's article titled "Clear Text Communication: Slaying the Beast Part II" talks about general issues concerning E-mail and security. Courier-IMAP is briefly mentioned in this article.
A patch that logs additional accounting information to syslog: ftp://ftp.aerasec.de/pub/linux/courier-imap/.