99.9 service availability

Hi All,

Customer is looking to migrate from Notes to Exchange 2007 and one of the
main goals is achieving 99.9 of email and collaboration service
availability.

They have 3 AD Sites belonging to an AD Forest/Domain, AD Sites are all well
connected (close to LAN) they have around 1000 users/mailboxes per site.

They want to minimise the number of servers used but keeping in mind high
availability and contingency topics as a main goal

I would like to know what your opinions are and getting your feedback
because looks like Exchange 2007 is cool but to provide maximum availability
you may need to deploy many servers.

I am thinking in:

3 Mailbox Servers using LCR or SCC, 1 Server per site

2 Hubs (DNS round robin) and CAS Servers (NLB) per site (both roles in the 2
servers)

2 Edge Servers (NLB)


This ends up with a total of 9 servers using LCR or 12 servers using SCC

Question 1: do you see any space here for implementing CCR? I do believe
they have to be configured in pairs so you would need 6 servers in a king of
ring topology so ..
Question 2: what about deploying just 1 Hub or CAS server per site and this
goes down? Is there any way to move all the client requests and mail flow to
other server in other site? I don't think so but want to double check

thanks


.

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