Our current Exchange server has multiple issues and I've come to the conclusion that rebuilding the Exchange server is probably the most reliable fix.
At the same time, I'll be upgrading the server from 2003 to 2008.
What I'd like to do is properly configure the Exchange Server to have the Web Front end in a DMZ but lock the datastore away from public eyes, at the moment the whole exchange server may be vulnerable as it's all the one server. What is involved here too?
I'd also like to set up multiple datastores, as we currently have it all configured in one which is about 400GB at the moment.
Is it worth maintaining the current Exchange server, but designating it as a backup? Does this mean emails are duplicated and effectively doubling storage requirements (this isn't an option, space at this point in time is limited)
The server is a VM.
Anything else I need to consider? Points will be split over most helpful answers.