See in your pop3 server, if your user there is into /home folder, example, if your user is "rohitsyte", try to create '/home/rohitsyte' and next, set owner with 'chown rohitsyte:users /home/rohitsyte' and last, set permissions 'chown u+rwx,go-r-x-w /home/rohitsyte'. Try to access your webmail again. If INBOX folders still not appear, goto your database and remove 'rohitsyte' user from all tables. Try logon into your webmail again. Anything, try to enable the IMAP log into main.inc.php.