Add Zoho Mail for users who do not need Zoho One

We have licenses for ZOho One for teams that need to use the suite of products that Zoho One offers. We have 8 more people who only need email access and we would like to add just a Zoho Mail. They do not need the Zoho One license. We are currently using Outlook for our email manager and would prefer to use Zoho Mail. Microsoft allows us to mix and the license of products and suites without any issues but Zoho seems to make the organization purchase more of the Zoho One Licenses with the ability to al la carte individual apps.

Does anyone know of a way to add a Zoho Mail license or a work around?

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How to Add Users to your Organization in ZohoMail?
A better clarity so you can create other users to start using Zoho Mail. You can directly Add Users from the Control Panel to your Organization. You can invite users with the existing email address. If the person (user) already uses ZohoCRM, then you can import users from Zoho CRM. You can also import them using a .csv file. (if you are planning to add them in Bulk) In this topic, We will be discussing on how to Add and Invite users only. The Import options are self explanatory. ____________________________________________________________________________________________________________