We are in progress testing Zimbra suite network edtion but unfortunately it didnít support using webmail without using the hole suite and this is disappointed because we have our mail server and itís stable and we only need the webmail .
Meanwhile, we have test zimbra suite and itís pretty good but itís hang from time to time with obvious reasons and we are concern about this since the mail service is a critical service and we canít move to Zimbra till we are sure about stability.
Our mail server uptime more than 600 days vs Zimbra we had to restart it from time to time by weekly some time.
And we read some news that you will publish standalone webmail and it will be great news if you confirm that and how long it will take to release this.