Can anyone shed some light on how Plesk sets up applications and application pools within IIS? Specifically; - When installing Drupal via the official APS installer, a number of additional applications for the site are created within IIS for the Drupal "sites" folder (and numerous sub folders) and the "tmp" folder. Why and what is doing this? - Sometimes separate application pools will be created for specific domains but I can't see any settings that are causing this nor any pattern as to when it happens. Though one cause *may* be adding an SSL certificate to the site. The above has caused us a major issue recently, with files within the "sites" folder being inaccessible which was eventually resolved by deleting the additional applications that had been created. So there is an actual problem here and I'm hoping an explanation of the above points might provide me with some pointers for a permanent resolution. If it helps, we're currently running Plesk 10.0.0 on Windows Server 2008 R2 with IIS 7.5.