The Zimbra Team is releasing a new licensing package targeted towards users who want some of the features of the Network Edition, but fewer users (limit of 15).
The package is US $399.00 and includes backup/restore and Connectors (iSync/Outlook).
ZCS Network Starter Edition is an annual subscription for software and updates only; it doesn't include Zimbra Support and cannot be upgraded with more licenses mailboxes, Zimbra Mobile or Zimbra Archiving and Discovery.*
The package can be purchased through our website here: http://www.zimbra.com/quote/starterpkg.php
*You can ofcourse upgrade to the Zimbra Network Professional Edition - 25 user license which includes support in case you would like to license Zimbra Mobile or Zimbra Archiving & Discovery.