Which Windows Version do I use?

I just received my eopen volume license keys... and links to download the associated software.  I have brand new servers.  I want to install 2008 Enterprise on 2 physical servers and use hyper-v to host three virtual machinse each File Server, Exchange 2010, BES, etc).  These servers will be clustered and all VMs will sit on one machine, if needed, in an emergency.

Which software should I download

1- Windows Server 2008 R2 Enterprise with SP1
2- Windows Server® 2008 Enterprise with Service Pack 2

A- Windows Server 2008 R2 Standard with SP1
B- Windows Server® 2008 Standard with Service Pack 2

When do use R2?

Thank You.
howmad2Asked:
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GeodashCommented:
Look at your comparison chart here

http://en.wikipedia.org/wiki/Windows_Server_2008_R2

Sounds like you will want

Windows Server® 2008 R2 Enterprise

because it comes with licensing for 4 virtuals + the host. The virtual host needs to be enterprise.

Use

Server 2008 R2 standard for Exchange, File, and BES. If 32GB is enough memory for your Exchange environment, depending on how many mailboxes.

Stick with R2, its MUCH better, assumed all of your hardware is 64 bit.
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hirenvmajithiyaManager (System Administration)Commented:
It is fine to go with Enterprise or Standard.
Have a feature comparison view at http://download.microsoft.com/download/F/C/6/FC6006B5-866E-42C1-88F8-9AC4B8BC610D/WS%20Brand%20Pages%20-%20Editions%20Comparison%20Guide.pdf

Here are the new features available in R2 http://technet.microsoft.com/en-us/library/dd391932(WS.10).aspx

I think you should go with Windows Server 2008 R2 Standard Edition, if price is considered.

Hiren
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Praveenraj04Commented:
Hi Friend,

It is advicable to take Windows Server 2008 R2.  Because Microsoft is closing all their support for the Earlier Version of Windows Release including ( Windows XP & Windows Server 2003).

So always go for a Higher Version which is available now in the market.

Please give me your view on this comment.

Thanks,
P. Praveen Raj
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satanistCommented:
After setting up Server 2008 R2, be very careful about setting up Exchange 2010 on virtual servers:

http://www.windowsitpro.com/projectplans/exchangeserver2010/detail/tabid/4555/catpath/exchange-server/topic/Going-Virtual-with-Exchange-2010
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GeodashCommented:
If you are running 3 Virtuals, you will need additional licenses in R2 Standard. Enterprise comes with 4 licenses for virtual. Way the costs vs the cost of the Server versions.
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GlobalStrataCommented:
Please look at the chart given in previous post.  Windows 2008 R2 is the way to go due to the improvements in Hyper-v.  Standard Version does not have clustering capabilities.  So if you want clustering, you have to use Enterprise.

Are the Virtual Clients also going to be clustered?  If so, then you will need Enterprise as well for each of them.  Otherwise Standard will suffice unless you want to do advance DFS with your File Server.
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howmad2Author Commented:
Thank You.
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