Lets be positive, finding this kind of typos even errors, is beneficial for all of us. As I used this HowTo on CentOs 5.2 with current version of available software updating the HowTo will be a peace of cake
ITS FIXED, repeat, I , yes yes, I made a typo in horde/imp/config/server.php, there was one <?php to many. Found it out from the web server logs. I can now login to horde.
Now my final step is to get external pop3 accounts to the virtual users mailbox. I thought of using fetchmail, will look into it.
If anybody has an idea, I am open for suggestions.