No, deactivating a user does not remove them from Zoho CRM. Zoho CRM lets you activate a user again at any time. Follow these steps to activate the user again.
1. Log in to your Zoho CRM account with administrator privileges.
2. Click Setup > Users & Control > Users.
3. In the Users page, select the Inactive Users view from the drop-down list.
4. Move the mouse pointer to the user you want to activate and click the Activate link.
5. Confirm the activation.
Now, the user is activated and a system-generated mail about the reactivation is sent to the user.