If you're attempting to install Joomla 1.6 on your 1and1 web hosing package, after uploading the Joomla 1.6 package, you may see the below error when you naviagte to your Joomla url in a web browser:
Your host needs to use PHP 5.2.4 or higher to run Joomla 1.6
To rectify this problem you'll need to add the below to the top of the htaccess.txt file at the root of the Joomla 1.6 package to map .php to the php5 engine.
# 1&1 addition to map .php to the php5 engine
AddType x-mapp-php5 .php
Alternatively you can download my htaccess.txt by clicking here.
Next, rename htaccess.txt to .htaccess and upload it to the root of the Joomla 1.6 package on your 1and1 web hosting package.
You should now be able to continue with the Joomla 1.6 installation by naviagting to your Joomla url in a web browser.