ISCal is available in two packages:
The integrated version of ISCal includes ISMail GP, a fully secure, reliable, enterprise-class mail server together with ISCal shared calendaring.
Integrated ISCal includes everything needed to operate a complete, seamless email and shared calendaring system.
Integrated ISCal is best for organizations that want an email and calendaring system right out-of-the-box.
The standalone version of ISCal is a software component which can run completely on its own, or be integrated with existing web and/or mail servers.
Standalone ISCal includes everything needed to operate a shared calendaring system, designed to operate with existing server software.
Standalone ISCal is best for organizations that already have email systems and do not wish to change their mail server.