You have a Microsoft Exchange Online tenant that contains 1,000 user mailboxes and 10 mail-enabled users. The mail-enabled users have email addresses in two SMTP domains named fabrikam.com and contoso.com.
You need to convert the mail-enabled users into user mailboxes.
What should you do first?
A. Remove the remote domains of fabrikam.com and contoso.com.
B. Assign a license to each user.
C. Add the users to an Office 365 group.
D. Modify the email forwarding settings of each user.
