Sizing exchange 2013 for virtualization

We are about to virtualized exchange 2013 and was hoping someone could give basics about sizing to verify we are on right track.

10,000 users with 3GB mailbox size and 150 messages sent per day. I have also been asked to provide 99.999 uptime and I am not sure if DAG provides that high level.

Thanks for any helpful hints.

J
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onlinerackAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The deployment will be the same for physical or virtual servers.

see here for the calculations

http://blogs.technet.com/b/exchange/archive/2013/05/06/ask-the-perf-guy-sizing-exchange-2013-deployments.aspx
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onlinerackAuthor Commented:
Thanks for the response Andrew, mgmt asked for five 9s availability. Will DAG be enough? What solution would be recommended?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
5 9s

99.999% ?

Not even Microsoft Office 365 provide that!?
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onlinerackAuthor Commented:
So what is the best solution for high availability with near zero downtime?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Office 365 or your own on-premise solution, but to need to select realistic Uptime!

I think 5 x 9s (99.999%) is less than 8 minutes of downtime!
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onlinerackAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for onlinerack's comment #a40196596

for the following reason:

An acceptable solution link provided. A bit more info would have been helpful.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If the sizing was Acceptable and Helpful, please Assign points.
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