Creating Outlook Anywhere Migration endpoint for Cutover Migration - Exchange 2007

I have a on-premise exchange 2007 server that we will be moving to Office 365. This is my first time attempting to run a cutover migration using the new redesigned O365 interface.

I am referencing this link http://technet.microsoft.com/en-US/library/jj874458%28v=exchg.150%29.aspx to create a migration endpoint.

When I enter the command "

"$TSMA = Test-MigrationServerAvailability -ExchangeOutlookAnywhere -Autodiscover -EmailAddress administrator@contoso.com -Credentials $credentials"

I receive an error that 'test-migrationserveravailability' is not a recognized as the name of a cmdlet

Can someone point me in the right direction? Do I need a different version of Windows Powershell?

Thanks