Actual Installation

To install Open Atrium the first time, you will run the "install.php" script from your web browser. NOTE when using a hosting company such as Pantheon, it will run install.php for you. The Install script will take you through multiple pages of steps. There is very little difference between this process and a normal Drupal site installation except that it takes longer to install the large number of modules.

Here are some resources for installing Drupal