Zoho is limiting the number of applications that can be used with the free account to five. They want to you to upgrade to the business account, which is still free but has a limited number of users that can be assigned to the same account and thereby share the services.
I would like to see the business plan that came up with this idea of limiting entry level users. Perhaps they are being overwhelmed. That would explain the limiting of applications, but I don't see where registered users can overwhelm a system such as theirs.
-30-