User account issue

Signing up to Zoho CRM needs a login Email ID, and signing up to other Zoho application needs a username and an Email address.

For example:
I first created a Zoho CRM account with a Email ID myname@mydomain.com. Then I couldn't creat a Zoho appication account with the same email address.

It seems that Zoho needs different accounts for CRM and other applications. Is it right?