Running AD and Domain Prep for Exchange 2010

When running AD Pre & Domain Prep commands to prepare my Ex 2003 environment for Ex2010 (Coexistence) will client email transmission be affected or impacted whilst running preparation commands? Or are these tasks transparent to the user?
CTCRMInfrastructure EngineerAsked:
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CTCRMInfrastructure EngineerAuthor Commented:
Another question:
When installing and configuring my new Ex2010 roles/servers (before mailbox migration) will the end user be impacted (how long for), and how long if any is email transmission affected?
Seth SimmonsSr. Systems AdministratorCommented:
will client email transmission be affected or impacted whilst running preparation commands?

no; this is an AD operation (schema extension) and not exchange-specific

are these tasks transparent to the user?


will the end user be impacted

there should be no impact during the installation
it's when you start moving mailboxes, changing hub connectors, etc. where there could be an impact
Will SzymkowskiSenior Solution ArchitectCommented:
It is recommended to run these commands on the DC holding the schema master role rather than letting Exchange Setup run these commands from the Exchange server itself. Make sure you prepare the domain/forest first, then install your Exchange 2010 environment.

Also make sure that before you upgrade your schema make sure that you have a complete backup of your AD using System State backup. This is to ensure that if there is an issue you will be able to revert back to your previous schema version.

I would also make sure that your AD replication is clean and error free before performing this change. Use the commands below.

repadmin /replsum
repadmin /showrepl
repadmin /bridgeheads
dcdiag /v


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CTCRMInfrastructure EngineerAuthor Commented:
This is a single isolated domain, 2 x Win 2k3 DCs and 2 x Win 2k12, all are Global Catalog servers.
There is a single Ex2003 and I've built a number of Ex2010 servers so once Ex Roles & Services are configured they will all coexist.
Should I run the Schema/AD/Domain tasks whilst logged onto one of the 2012 DCs? as it is a 64-bit system?
Will SzymkowskiSenior Solution ArchitectCommented:
You need to run this on the DC that is holding the Schema Master Role. You will also need to be a member of the Schema Admins group as well, to perform this task.

Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:

Make sure the user account which you're using that has the schema admin role & Enterprise Admin permissions. The functional level should be raised to 2000 native. Also important info during the mailbox move from exchange 2003 to 2010. Users will be unable to access their mailbox from Exchange 2003.

CTCRMInfrastructure EngineerAuthor Commented:
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