1. Can I use the Adobe Flex 4.5 SDK needed to run version 3.0 of the Flex viewer on my Flash Builder 4.0.0? I now run Flash Builder 4.0.0 with Adobe Flex 4.1 SDK but I don't know how high can I go on the SDK version. I got conflicting answers on the Adobe forum.
2. If I need to upgrade my Flash Builder to 4.5 to run Adobe Flex 4.5 SDK would I need to update all my previous projects or can Flash Builder to 4.5 use the lower SDK versions? I don't want to loose all my previous projects which they run on version 2.5 of the Flex Viewer with Adobe Flex 4.1 SDK.