Exchange
~2007~
typical server installation:
hub transport
client access (requires IIS installation - basic, windows, digest authentication + dynamic content compression)
mailbox
management tools
powershell
RSAT-AD domain services tools

layout:
5gb ram (2gb of ram + 5mb per user mailbox)
2 mailbox servers (no more than 4 storage groups per server)
2 client access/hub transport servers (load balanced)

mailbox server reqs:
IIS?

client access server reqs:
asp.net 2.0
IIS

partitions:
C: system partition
D: exchange binaries
database files
E: transaction logs

logging:
look into circular logging...

settings:
keep deleted items for 7 days

before setup.exe:
setup.com /prepareschema (run on domain schema master)
then
setup.com /preparead (maybe with /on:<organization name>

OWA: https://localhost/owa

EMS commands:
Set-ExchangeServer -Identity <Servername> -ProductKey <Productkey>