we use ZCS Open Source 6.0.5 in our company. Now some users want to use Outlook as Groupware-Client. Because the Outlook connector is only available in a paid version of the Zimbra-Server we need to install a second one as paid version.
Now my question: Is it posible to run two Zimbra-Servers (the "old" open source server and a new one with the capability for the Outlook connector) working together? We just want to move approximately 15 Users to the new server for the Outlook capability. Of cause all groupware features need to work also betwen the two servers.

Maybe someone has a hint for us how to do this? Thanks!