As mentioned in ther servers.php file, the Horde Project does not officialy support this parameter. Use at your own risk.
This documentation is also valid for MIMP 1.0.
Simple. The php imap_*() functions don't provide a way for us to get this information. Trust us, we would gladly use those functions if they existed.
Please see the documentation for the namespace function in imp/lib/IMAP/Client.php. Or you can try going to our API Documentation. (No guarantees this link will remain correct).
Thanks for asking. It looks like the following (this is an example of a dovecot-1.0 IMAP server):
'imap_server' => array( 'children' => true, 'namespace' => array( '' => array( 'name' => '', 'delimiter' => '.', 'type' => 'personal', 'hidden' => false ), '#foo.' => array( 'name' => '#foo.', 'delimiter' => '.', 'type' => 'shared', 'hidden' => false ) ), 'search_charset' => true )
Obviously, don't copy this code directly into servers.php and expect it to work! This is merely an example. Your IMAP server configuration is almost certainly different. Note: MIMP does not require the 'search_charset' value.