Exchange Server 2010 service pack 3 installation and domain preparation steps

Folks,

I'm now trying to repair the Microsoft Exchange Security Groups with the type "Unknown"

So which command should I execute first and what is the impact on the email flow during the business hours ?
here's the command that I can found so far:

/setup PrepareSchema
/setup PrepareAD
/setup PrepareDomain

My AD structure is just single forest domain with Windows Server 2003 as the domain & forest functionality level.
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Senior IT System EngineerIT ProfessionalAsked:
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Gareth GudgerCommented:
Just run the Setup /PrepareDomain command. This should recreate all groups. You will need to run this from a 64-bit operating system. It will have no impact on mail flow.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, so I assume that any 64 bit domain joined server will do.

and then what about the next steps, do I need to reboot each of the Exchange Servers to recognize the new AD security groups ?

or can I continue with the other two command for installing SP3 ?
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Gareth GudgerCommented:
ok, so I assume that any 64 bit domain joined server will do.

Yes. It would just need the RSAT-ADDS (Remote Server Administration Tools - Active Directory) installed.

and then what about the next steps, do I need to reboot each of the Exchange Servers to recognize the new AD security groups ?

Shouldn't need to reboot Exchange. The groups are part of Active Directory. But you may need a good 15+ minutes for directory replication to make sure all your DCs pick up the groups.

or can I continue with the other two command for installing SP3 ?

/PrepareDomain will invoke the other two commands. If you are missing groups I'd recommend running /PrepareDomain with the same media of whatever version you are currently on. Once they are back then run these commands from the SP3 media.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Gareth,

Thanks for the detailed explanation, so why is that I cannot run the command from the latest Exchange Server 2010 SP3 files ?

is there any harm or caveats when running from the latest ? because I cannot find my previous installation media.

The current version of the Exchange Server when I joined this new company is Exchange 2010 SP2.
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Gareth GudgerCommented:
Go ahead and try. Just thinking it may error out.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks once again.
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Gareth GudgerCommented:
You are welcome!
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