Forgive me if I am not understanding your reply.
I took on office365 small business premium trial. No trial for office 365 Small Business available. I want to purchase 0ffice 365 Small Business, one user licence. ( I already have Office 2013, 2010,2007,2003 ).
I cannot buy license, until I have a subscription.
Are you saying, I cannot transfer/retain Website, my mailbox and domains to Office 365 Small Business, from the trial?
I do not recognise your terms "Site Mailboxes" and "Site Collections"
Can you please clarify?
Regards,
Bill