Datbase Availability Groups without Server 2008 R2 standard edition, standard Exchange versus Enterprise Exchange

Enterprise Edition is a relatively expensive product compared to Standard. If I understood the Experts response to my original question I would need two copies of Enterprise in order to create an Exchange DAG without setting up clustering. Is that correct? Would I also need the Enterprise version of Exchange?

Can I have a DAG in some form even if it means clustering first with Windows 2008 R2 standard and Exchange 2010 standard? In other words, let us say I have two computers and I install Windows 2008 R2 on both and have 2 licenses of Exchange, can I somehow create an Exchange DAG?
lineonecorpAsked:
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MegaNuk3Connect With a Mentor Commented:
Yep, Exchange will configure all the clustering for you when you create the DAG or add a member to it.

Have a read of all the parts of this article:
http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/uncovering-exchange-2010-database-availability-groups-dags-part1.html
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MegaNuk3Commented:
You need Windows 2008 Enterprise for the clustering components...
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MegaNuk3Commented:
You need Windows 2008 Enterprise for the clustering components...
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lineonecorpAuthor Commented:
Thanks for the article.  Reading it it seems that I can have Exchange 2010 standard with DAG but only up to 5 databases as opposed to 50 I believe with Enterprise Exchange.  I am still not clear on the Server 2008 R2 Enterprise requirement.  Per  a demo I saw DAG was set up without any reference to clustering in the process - the person doing the demo never walked through any special clustering prep.  What this article seems to indicate is that even though you never have to explicitly setup clustering somehow the infrastructure for it has to be there for DAG to work.  So even though I never specifically create a cluster or do anything as far as clustering goes, DAG somehow does it invisibly? In other words I install Enterprise 2008 R2 on two different servers - never go into any clustering configuration - and then I install Exchange and configure the DAG - is that correct?
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lineonecorpAuthor Commented:
Thanks. I think I have the drift now.
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