In the test.php file there is an function uniqid without parameters.
In PHP4 the uniqid command does not accept this command without parameters.
Error Message:
Warning: uniqid() expects at least 1 parameter, 0 given in /home/.sites/102/site738/web/WEBMAIL/installer/test.php on line 123
Solution for PHP4 users:
Change the line
$insert_id = md5(uniqid());
into
$inser_id = md5(uniqid(rand(), true));
:-)