Exchange 2010 Standared edition and DAG - Disaster recovery

The question is what’s the minimum spec that DAG needs to work. According to SAMs “Exchange 2010 Unleashed” DAGs need the Enterprise edition of Exchange to replicate between two severs.
Does DAG then have any use in the standard edition of Exchange 2010 and if not can the standard edition have any sort of disaster recovery other than dial tone.

thank you
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You need to have 2008 Server Enterprise as your base OS as you will need to add Failover Clustering for DAG to work.

There seems to be some sonsiderable debate about DAG availability in Standard Edition of MS Exchange 2010. However Microsoft Licensing Team confirmed that DAG will be available on both EDditions of Exchange. The Only pre-requisite is that you need to have an Enterprise Edition (windows server 2008 R2 or Windows 2008 Enterprise Editon to do This) OS installed to support clustering features.

Essentially Both Enterprise and Standard Editions have same set of features,  License Key makes the Difference :)


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Glen KnightCommented:
DAG works with Standard edition of Exchange but you DO require Enterprise Edition of Windows.
I have written an article here on High Availability with Exchange 2010 DAG:

If you find the article useful then please vote for it :)
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"" On the server side, Exchange Server Standard will now support high availability, so all customers can take full advantage of the new database availability group capabilities.  Exchange Server Enterprise enables configurations with up to 100 databases per server. "" 
Comment from Julia White Director of Exchange Marketing, Microsoft (

Glen KnightCommented:
>>you will need to add Failover Clustering for DAG to work
You do NOT need to add failover clusting, the clusterincg is controlled by Exchange, the Failover Clustering components are installed as part of the DAG installation WITHIN Exchange.  The Failover/database copy/witness server are all managed from within the Exchange Management Console.
>>you will need to add Failover Clustering for DAG to work .. Not right info. Exchange Takes Care of all clustering needs for DAG to work.

JPFNAuthor Commented:
Excellent and amazingly fast answers from Hilal1924 and demazter
I just wish I could give you both the 500
Deepest thanks from
Glen KnightCommented:
JPFN, Glad you got the information you required.  Did you check out my article?
JPFNAuthor Commented:
Hi demazter
Indeed I intend to use it as a guide for a test lab.
Thanks again JPFN
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