Access to the website http://office.microsoft.com/en-001/.
Click to Tab “For business” => click to Discover more >
Here is page for Business
Click “Compare plan”
Choose Office 365 Enterprise E3 then click Free trial
Input your information
Choose “Send text message” to your mobile phone number
Add Code form mobile phone text message to “Verification
code” then click Create my account
Finish your registration
Waiting for services will be commpled
Good luck!