Since El Captain Mail doesn’t use the accounts.plist file anymore but the Accounts sqlite database as far as I can see. Which can be access with ACAccountStoreMBS. From the accounts.plist file I used to get information about Exchange accounts in Mail. More specifically the CachePolicy value to see if all mails are downloaded to the computer. For other account types I can get this information with AppleScript but not for Exchange.
Is this possible with ACAccountStoreMBS?