mb_convert_case not available even though listed in phpinfo

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http://serverfault.com – when using php's mb_convert_case on an older production server, I get the following error: Fatal error: Call to undefined function: mb_convert_case() in ... So I checked and read mb string functions are not a default module. Printing my phpinfo() it returns php version 4.3.9 (php docs say mb string functions are available PHP 4 >= 4.3.0). In the very top of my phpinfo() I find the following string under "build command": '--enable-mbstring=shared' As far as I can tell, this should mean mb string functions are installed, should it not? Why am I getting that error? P.S.: The script as such (HowTos)