Has Zoho changed the login process for new accounts?

Has Zoho changed the login process for new accounts?

It appears that Zoho has changed the login process for new accounts.

Previously when a new account was created Zoho asked for a username and email address.  Once the account was created the username was required for login.

Now when a new account is created Zoho does not ask for a username, but ONLY an email address.  The email address must be used to login.

I have 75 users who were set up with usernames.  Can users still log in with the username?  Or do they have to use the "email address" associated with the account? 

Do you plan to switch over to the email address based login only?

Does Zoho have any further changes in mind to the account creation and login?