Hi,
This link http://office.microsoft.com/en-us/office365-suite-help/can-i-switch-to-a-different-office-365-plan-or-subscription-HA104031833.aspx#_Switch_plans_without says it is possible to switch from Small Business Premium to Enterprise E3 using the switch wizard, but when I follow the instructions, I cannot see the E3 plan in the licenses page to "switch to". Can anyone help?