What is the difference between the mail app in personal.zoho.com and mail.zoho.com

What is the difference between the mail app in personal.zoho.com and mail.zoho.com

I've noticed that I can see both the mail application on personal.zoho.com and I can logon to mail.zoho.com, however, the inboxes for the two applications are different. In my personal.zoho.com mail inbox, there is a message welcoming me to zoho mail. That message does not exist in the mail.zoho.com inbox.

What is the difference? Aren't they the same application?

Thanks,
Jeff
jeff.bowman@zoho.com