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Jay SchweglerFlag for United States of America

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Hardware Sizing for Exchange 2010

I'm going to be migrating from Exchange 2003 to 2010 over the course of the next few months and will be purchasing a new server for 2010. I currently have 47 mailboxes on the Exchange 2003 server.

My first question is whether or not to split up the Exchange roles by server. I would either do a CAS/HT server and a MBOX server, or CAS/HT/MBOX all on the same server. I'm leaning towards putting all the roles on a single server since this is such a small environment, but I'd like to hear some opinions on this.

Concerning hardware, assuming I put all roles on the same physical server, I was looking at a single 6 core processor with 16GB RAM. I was also going to do all SATA drives since Microsoft has approved SATA with Exchange 2010. RAID 1 for OS and logs, RAID10 for mailbox database.

The processor recommendations are a pretty wide range and I want to know if I'm going overboard (or underboard) with my choices. Thanks for any help you can provide.
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Okay, so all roles on single server, easy enough.

Is 16GB RAM overkill here, would 8 or 12 work?
16 is a good point to have it at, actually. Exchange will use everything you throw at it.
Okay, but you don't think I need an additional processor right? One six core Xeon E Series should be ok?

Okay, last question I forgot to include in the original topic was for RAID.

I was planning on doing a RAID 1 for the OS and Trans Logs, and then either another RAID1 or a RAID 10 for the mailbox volume. I'm thinking that doing that RAID 10 is probably a waste being that I have 47 mailboxes. Thinking about just doing 2 RAID 1's.
You could get away with a dual core for the number of users you have. 6 should be great. For RAID, RAID 1 on the OS and Logs drive is just fine. RAID 10 might be a bit overkill, but it'll work well for you. RAID 5 or 6 with hotspares is usually sufficient on smaller exchange environments.