The Internet Message Access Protocol (IMAP) is an Internet standards-track protocol for accessing messages (mail, news, etc). The IMAP server stores and provides access to messages.
A list of answers to common installation problems is maintained in http://asg.web.cmu.edu/cyrus/imapd/install-FAQ.html. It is very out of date and will eventually be updated. The file doc/html/questions.html contains a list of questions we'd like to answer but haven't gotten to yet.
Please refer to Sending Feedback if you would like to submit a bug, feature request or patch.
For detailed changes, refer to the file doc/changes in the distribution.