I've been working on Azure Resource Group templates quite a bit over the last few weeks. While it has been a pleasant experience overall, I ran into some hurdles the other day while attempting to figure out how to create a Microsoft.ClassicStorage/StorageAccounts using the Azure Resource Manager(ARM) API.
The latest version (2.7 at the time of writing) of Azure SDK GUI tools for visual studio were not particularly helpful in generating the required json, but thankfully this post pointed me in the right direction. And after a little bit of fiddling I find that 2015-06-01 appears to be last supported apiVersion that works with classic storage.
Here's the final script I used to create a classic storage container: