Mail 6 - Change the order of email accounts

Hi,

I've recently had a few changes in my email account information and have updated Mail 6 to suit. Now my Exchange account is always at the top (and therefore the default account) despite it being deleted and recreated to make it the last account. Is there any way to force this account to a different position or indeed to simply reorder the entire list? It is very irritating that it isn't a simple drag-n-drop solution.

Regards

Tom