Looking at documentation I see we need AD server on-premises and Office 365 Small Business.
1. Which version of Small Business is this supported? I see 2 options in MS site: SMB or SMB Premium
http://office.microsoft.com/en-us/business/compare-all-office-365-for-business-plans-FX104051403.aspx
2. Why do we need AD server on-premises?
3 Which features are supported with Office 365 Integration?
Thanks
-Gonzalo