Zoho ONE confusion

Zoho ONE confusion

I'm really confused by Mail.

I signed up for ONE, for my company, CATI.  We have email though GoDaddy and Outlook.  When I opened mail for the 1st time it had me create a new email with the same domain as my godaddy  emails (livecati.com)

will all my employees get ANOTHER free email with Zoho One?  Can we migrate everything over if we choose?