Another win for Office 365 and security! Up until now Office 365 Dedicated with ITAR had the ability to meet FISMA. Now Office 365 Enterprise Services (the multi-tenant cloud) has a FISMA authority to operate (ATO). Please review the following for more details about this announcement -
http://blogs.office.com/b/microsoft_office_365_blog/archive/2012/05/03/fisma-security-certification-office-365.aspx