Exchanger Server 2010, OS upgrade

I have an exchange server 2010 running on Windows Server R2 Standard edition.
Would like to implement DAG.
Is the OS upgrade from standard to Enterprise on the existing Exchange Server supported??
guerafAsked:
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RadweldConnect With a Mentor Commented:
What I meant was before you rebuild the old server you will have to redirect mailflow to the new server as well as the cas endpoint. Once your two servers are in a dag you would need some kind of load balancers to provide ha of the cas array located on the two servers.
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RadweldCommented:
I'm afraid not (to the best of my knowledge anyway) you would need enterprise windows due to the elements of failover clustering which is only part of the enterprise version.

Your options would be to build two new enterprise servers, configure your dag and move mailboxes over or you could try backing up your database and log files rebuild the server as enterprise and then attempt a dr recovery running setup wih the /recoverserver option.

Never tried the latter so not 100% it would work and it would require some downtime wIth lots of risk.

Building two new servers has the lowerst risk and is the easiest.
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guerafAuthor Commented:
How about introducing a second exchange 2010 server with enterprise OS already, transfer all mailboxes to it.
Uninstall orginal Exchange and upgrade OS to enterprise windows and reinstall exchange on it.
Then configure DAG after.
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RadweldCommented:
Yeah that's a variant of my first option and totally supported just bear in mind if your co locating hub and cas roles how your going to switch those. I've used this option before and it works ok. I would advise using a new name for the server, thus will help diagnosing any lingering issues after the rebuild.
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guerafAuthor Commented:
Create some CAS Array/Load Balancing scheme to move the CAS and Hub roles out first??
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guerafAuthor Commented:
Some type of hardware load balancer which I assume would take care of the CAS and HUB roles issue??
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guerafAuthor Commented:
Thanks!
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