Is this the same zimbra?
Oracle Beehive Zimbra Help page
All I could find was this video sort of confirming it: YouTube - Oracle Beehive e a interface Web Zimbra
How old is that video? The copyright says 2005-2007, must be 5.0.0 at the latest!
Anyone is free to use the open source edition :)
It appears Beehive uses a connector to your current Zimbra install.