Zimbra tuning

General information for the business: Zimbra Open Source tunning Description of requirements/functionality: Hi, we are a small IT company and we have a new Zimbra Open Source VPS server with 4GB of RAM and 2 dedicated cores and would like to implement a couple of things to share resources with some TEST clients and make "partitions". Please, only people with a lot of experince with Zimbra and other email solutions. We will request to show and demonstrate your Zimbra knowledge. Also we will require some time to talk via skype BY VOICE, since for us to chat all the time is a lost of time that we hate. We can chat with some things, and we WILL NEED TO TALK other times. - We have another large storage VPS in the same datacenter's LAN, so would like to setup and assign independent storage to every customer. We already have other VPSs and know how to use NFS, samba and other techs, etc, but want an expert to recomment the best and more robust way to do this. - Configure Z-Push in the system, like this one ([login to view URL]) or this one ([login to view URL]) - Give us some consails to go ahead and after testing go do business - Provide affordable and reliable management for this and similar technologies in the future. We want something easy, affordable and we will study the option to keep working with you (we're always doing things with IT).