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I have a brand new CentOS server that I just rented from a datacenter. You will need to install the LATEST (3.0) Kolab groupware server, with all of its functions, and transfer the existing mail from our old mail server to this one with a script, keeping the folder hierarchy in the imap as well as the message timestamps. Also, install webmin please :)
As this is a very simple task, budget is set at $50 max.