Using zoho one and keeping email addresses free

Using zoho one and keeping email addresses free

Hello,

I'm currently in the process of testing zoho one. There are some application which I need the full version, while others I don't. Here is my question...
I need the CRM, Project, and Books as full version. I also use email. Is it possible to have the apps I need with one username using it as Zoho One, and have 5 mail user using the free version. In other words, if I am using Zoho One, can it be mixed with the free version as well?

Thanks in advance.