Functionality questions regarding Mail account

Functionality questions regarding Mail account

Hi,
 
I'm evaluating Zoho mail via a personal account to see if it would be useful for my small business (I'd use a business account, if so). I have several questions:
 
1) I don't see how to add an email filter. When I go to Settings | Mail Organization | Filters, there is no "add filter" link or button.
 
2) I don't see how to add another email account. When I go to Settings | Mail Accounts, there is no "add account" link or button.
 
3) Is there a way to backup all data (email, calendar, contacts, tasks, notes) to a local drive on my PC?
 
4) If using Outlook 2010, can it synchronize all data (email, calendar, contacts, tasks, notes) between Outlook and my Zoho online account? 
 
5) Are there any plans to create a Zoho client application that will synchronize all data (email, calendar, contacts, tasks, notes) between it and my Zoho online account? (I'd like to ditch Outlook...)
 
Thanks for your assistance,
Joan