We have a demo of Zimbra on Redhat that is about to expire.
Is it possible to still use it as a standard mail/imap/group calendar server after the license expires?
Should we install the open source version instead if we don't plan to use any other features?
How easy would it be to convert the open source version to the pro version if we choose to need the pay for features?
And lastly, I understand that Zimbra will finally have true external LDAP integration in Q2 (meaning that it will fully integrate with an existing external dir service). When does the open source version get these upgrades?