I had setup opensource zcs 4.5 server in my local premises, which is in
production envirnoment for one customer with 90 mailboxes

Now, we have taken space in vsnl datacenter and plan to put zimbra there
on new blade server.

I need to migrate zimbra from local server to blade server which is at ISP

what is the best way to do that

please provide me the steps, if you have to do that ?????