Dear Tsinka,
I think I'm having the same problem, PHP Pear is installed and when I view the phpinfo() this is the path:
include_path .;C:\php5\pear .;C:\php5\pear
I included as you suggested to another user this on the top of the script:
ini_set('include_path', ini_get('include_path'));
but still, when launch the php script, I receive the following message:
Warning: include(Mail.php) [function.include]: failed to open stream: No such file or directory in E:\Apache Software Foundation\Apache2.2\htdocs\contacts.php on line 7
Warning: include() [function.include]: Failed opening 'Mail.php' for inclusion (include_path='.;C:\php5\pear') in E:\Apache Software Foundation\Apache2.2\htdocs\contacts.php on line 7
Fatal error: Class 'Mail' not found in E:\Apache Software Foundation\Apache2.2\htdocs\contacts.php on line 114
if please comes something in your mind how to try to fix.
Thank you in advance.