Hello.
Yesware is the missing link I've been looking for in email / crm / erp. It tracks opens and clicks - that is, for those who use Gmail or hosted Gmail.
http://www.yesware.com/product-tour
If Zoho Mail + CRM added this natively via a Zoho app, I would move over to Zoho mail completely. As things stand, I'm jealous of Salesforce and other CRM users who can integrate Yesware, and will be doing my best to integrate in an ad-hoc way.
Thanks for a great and constantly improving platform! Looking forward to the ongoing integrations between Zoho CRM and Zoho Books.