note 57176 added to function.imap-open

Dear Friends, I have set up PHP integrated with IIS 6.0. I tested some PHP pages, it works normally. But why when I use imap_open, I received an error: ---------------------- Fatal error: Call to undefined function: imap_open() in E:\Working\MailSuite\www\test_IMAP.php on line 2 ---------------------- This is the command that I have used: ---------------------- $mbox = imap_open("{192.168.0.1:143}", "abc", "abc"); ---------------------- Can you show me how to solve the problem? Thanks, ---- Manual Page -- http://www.php.net/manual/en/function.imap-open.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57176 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57176&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57176&report=yes Search -- http://master.php.net/manage/user-notes.php