great product.

I need to automatic send recurring notifications to my clients by e-mail every year since they registered a service.

For example:

1. client or contact "Mario" buyed a product on "27th February 2014"

2. every year, the 27th of Genuary (one month before the expiration) an automatic email is sent to client in order to renew the product buyed

How can I make this possible with workflows or other in zoho crm?

Thanks in advance,
Cheers!

Marco