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When would I need to install Windows 2008 Enterprise? Is this only for server clustering, otherwise is there a need for me to purchase it?

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Key differences between Editions for Windows Server 2008 R2

"Microsoft Exchange Server 2010 is available in two server editions: Standard Edition and Enterprise Edition. Enterprise Edition can scale to 100 databases per server; Standard Edition is limited to 5 databases per server." per MS Technet

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+1. Also see here: microsoft.com/windowsserver2008/en/us/r2-compare-specs.aspx –  joeqwerty Nov 2 '10 at 18:51
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If I recall enterprise exchange allows for an greater or unlimited amount of storage groups.

yep that seems to be it Enterprise Edition can scale to 100 databases per server; Standard Edition is limited to 5 databases per server.

Source: http://technet.microsoft.com/en-us/library/bb232170.aspx

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By segmenting our users into different SGs, we can easily control the different levels of email quotas. –  jftuga Nov 2 '10 at 18:53
    
+1 - Thanks on the Exchange side. –  makerofthings7 Nov 3 '10 at 13:51
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I'd be surprised if you need the Enterprise version of Exchange 2010, but if you want to use the HA features of Exchange 2010 Standard, you still need Windows Enterprise edition.

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I have 80 databases... so yes I need Enterprise Exchange; thanks –  makerofthings7 Nov 3 '10 at 13:53
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You also allowed four licensed virtual machines with each Windows Server 2008 Enterprise license.

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