Thank you! Yes, it's there. I would like to install Active Collab project management tool, and it requires this module. I used this software on my previous servers before, but this time it's not works, due the php-imap error. :/
If I correctly understood you install this software on one of Plesk domains? Try to check with phpinfo() function that imap module is enabled for this domain. As you may know, php settings can be modified for separate domain instead of using server wide php settings.