A client is planning on bringing their outsourced email configuration in-house. Most designs that I see are large to very large. This design is for a small configuration of 100 users with a few 1000 inbound messages and a few hundred outbound messages daily. High availability and reliability are critical, however.
This will be a new system, so all equipment and software will be purchased and current.
Can someone provide me recommedations for a minimal VMware/Exchange configuration that still provides availability and reliability?