Thank you for your answer! I am kind of confused between ADF and API. I understood from server functionality matrix, that 9.3 works only with ADF, when 10 with API. In this case �?? does Flex in 9.3 works with ADF or API? Which version of Flex and Adobe Flex Builder will I need to use to make web application for 9.3 and which for 10? I also understand that Flex works for 9.3 and 10, when Silverlight with 10 and 9.3.1. Is there any way I can use Silverlight in 9.3? My web page must have two options: possibilities that the user will submit Excel file (which later will be processed on server and displayed as a points on the map presented to user), and possibilities that the user will drag/edit points on the map and this request will be again submitted to server. Does Silverlight or Flex supports those options, and if yes, which versions of Flex/Silverlight does and with which versions of server they work?