IMAP doesn’t exist. PHP must be compiled with IMAP enabled.

First off this is not an eventum problem. This is an apache/php problem.
If you ran “apt-get install php5-imap” then you installed and enabled imap.
You need to make sure that you restart Apache afterwards. The install
script enables php5’s imap when you ran it.
To be honest there are so many places where this could reside (based on
flavor) in Linux that I couldn’t begin to tell you where it might be in
your installation. Here are just a couple locations:
/etc/php5/apache2/conf.d/imap.ini
/etc/php5/php.ini
/etc/php.ini
/etc/apache2/
/etc/php/php.ini
The short of it is some where your install script places something similar
to:
; configuration for php IMAP module
extension=imap.so
in the extensions section of your php.ini or an included config file some
where on your machine.