Hi, I need to install exchange 2010 (Windows 2008 R2) and then migrate old user accounts from Exchange 2003 server (Windows 2003 R2). Im planning to install CAS/HT/MBX roles on same server as the user base is only 15. Im not installing ET coz we subscribe to Messagelabs filterning service. Im proposing DL380G7 Dual Quad Core server with 16GB Memory (Performance server) on C: & D: drives. C: drive will have 2*300 GB with 0+1Raid. and D: drive will have 5*300GB with RAID5. I have proposed Windows 2008 R2 with Enterprise licence and Exchange 2008 with standard licence. I will be getting similar server on our DR Site and will be setting up DAG. We have only 1 Mailbox.
My question is, would it be ok to use only 1 server and have all the roles as the user base is fairly small. I will also be grateful if someone could advice a good online source explaining pre-requisites and the detailed installation steps for exchange 2010. Thanks