This book covers the CRM version 6.5.0 and is a step-by-step guide to using this powerful CRM application in your business and provides a practical, hands on introduction for beginners as well as experienced CRM system administrators. It covers such topics as navigating and personalizing the system, working with accounts and contacts, using e-mail, managing activities and reports, and security.
If you are seriously interested in vtiger CRM you can't be without it. This book has been written for users and administrators only.
If you are looking for developer support you may visit vtiger's web page.