MailEnable Enterprise Premium is a fully featured Outlook integration component for mail, calendaring, contacts, and collaboration. The new MAPI solution provides complete integration between the MailEnable server and Microsoft's Outlook email and office productivity client. Premium Edition also includes all the value of Enterprise Edition.
Calendaring integration is one important advantage of a MAPI solution. To extend on that for the corporate scenario, Outlook supports meeting invitations. You can schedule a meeting with others in the office, and they will receive an invitation in their inbox. They then have the option to deny your invitation, suggest another time that suits them better, or accept, in which case the appointment is immediately added in to their calendar.