I have a client with an SBS 2008 server 32-bit which needs replacing - it is limited to 4 GB RAM and they have grown quite substantially in the last year. Their mailbox database is 230 GB and public folders are 37 GB. This is an increase of 25% in the last 4 months. There are around 20 mailboxes.
The short term problem is that it will take ages to export the mailboxes and import them into a new mailserver so a big bang approach which I usually use will not work (do the whole lot over one very busy, stressful weekend).
My idea is to replace it with two Server 2012 R2 servers, one as DC and the other as Exchange 2013 server STD edition. The Exchange would have 6 cores and 32 GB RAM and they would both be VMs on VMware. Would this be enough? Also should I split the users over several mailbox databases to reduce load? - how many?
I've heard that I could configure the existing Exchange to forward unresolved recipients to the new Exchange machine, thereby allowing me the luxury of migrating users to the new domain / mailserver one at a time, is this a valid idea?
The second problem is that I would like to reduce the overall size of the mailbox databases by having some for of archiving - certainly not to PST files !! Does anyone have a recommendation on a product to do this?