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Exchange Implementation

HI
we are in process of implementing MS Exchange 2007 at our organisation. I have bought a storage, and 4 server. Two mailbox servers one edge and two cas/hub . I would like to know the best design to implement the exchange 2007. We have total of 3000 users. We will be using OWA heavly from external
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mishalk
Asked:
mishalk
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1 Solution
 
MesthaCommented:
For an org that size - hire a consultant.
There are an awful lot of things that have to be taken in to consideration, domain design, mailbox layout, email flow etc. If I was asked to design a site for that number of users I would probably be on site with the client for two to three days to get a good idea of the user environment in order to design something that will work. With all due respect, I am not going to sit here and give you £2500 of consultancy for free.

-M
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mishalkAuthor Commented:
thanks for your comments Mestha, i already have a plan with me..i thought i good get a good discussion here in the experts-exchange.
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gupnitCommented:
Hi,
Mestha has a point, but since you have asked a question here and we contribute, let me take you through.....
Give me this information:
  • How many number of users - OK 3000
  • How many sites do you have - Ok, I would assume 1 here
  • You said 4 server, but then said 2MBx, 2Hub/CAS, 1 Edge, that makes it 5?
  • What is Storage in hand that you have, what high availability solution are you expecting
  • What are mailbox policies that you have in mind.
  • Security - What AV/AS products are you loking at, where will they be installed. What about certificates.
With 5 servers.....and 3000 users, I would
  • 2 Mailbox Roles with CCR
  • 2 Hub/CAS servers load balanced
  • 1  Edge Role in perimter
Thanks
Nitin
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mishalkAuthor Commented:
a correction: no of users is 1750 only
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mishalkAuthor Commented:
users: 1750,
no of sites: 1
Total Servers: 5
Two servers with 16 GB memory,  two quad core processors
remaining server : quad core with 8 GB Memory
Storage : 2TB
Security: Sidewinder, blucoat and ASA 5500, Borderware email applliance

I am planning clustering. And OWA usage is also higly considered
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mishalkAuthor Commented:
forgot the load balancer : cisco load balancer
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gupnitCommented:
Hi,
You have it all, and you seem to have got it all right too. What is your concern here..May I ask you.
Considering that this is what you are planning, well with 1750 users, I am also sure you have taken into consideration, mailbox sizes, growth plans for next 5 years, compliance and mail retention plans.
Go ahead, let us know what is on your mind that you want to discuss
Thanks
Nitin
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mishalkAuthor Commented:
hi

i am attaching a sample diagram which i am planning. IPS and Boarderware appliance is new. Where would be the best place to keep that.

Do you suggest my load balacer to be kept under dmz and the hub/cas should be under dmz.  And how about owa. Do i need to dedicate a machine for owa?

exchange.jpg
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gupnitCommented:
Hi,
One by one:
  • IPS etc should be in DMZ.
  • Hub/CAS will be load balanced and will be in LAN, so will be Cisco Load Balancer
  • OWA is made avialble by CAS role, so there will be necessary ports to be opened for CAS server access
Let me know
Thanks
Nitin
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mishalkAuthor Commented:
forgot to mention about the certificate. I am planning a windows CA server and issue certificate. But my question is i havent tested those certifcate for external. Will i able to use the ms windows CA for external users(for OWA)
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mishalkAuthor Commented:
fine. Yes Ips will go the the dmz. boardware appliance will keep as a gateway for the emails. And what about the certificate i mentioned earler
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gupnitCommented:
Technicall yes, but practically speaking and issue that you will face, NO do not use that.
Use thrd party external certicate Ex from Godaddy etc, they are cheap
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mishalkAuthor Commented:
thanks, i will see the pricing of it..and thanks a Nitin for your support...
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gupnitCommented:
Hi,
Glad to help. Also do not forget to close the question, once done with it
Cheers
Nitin
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