Exchange MC error

We have 2  root domain controllers (DC1, DC2) a new DC3 has been added and roles moved out of DC1 (domain.com), 2 DCs in Sud-domain and Exchange (EXCH) and all users (subdomain.domain.com)
I shut down DC2, and when I use EMC to add users, at the point of I need to checnge OU for the new user, I get an error, and EMC closes

Error in Event viewer
Log Name:      Application
Source:        MSExchange ADAccess
Date:          3/8/2011 11:05:56 AM
Event ID:      2130
Task Category: Topology
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      EXCH.Subdomain.domain.com
Description:
Process mmc.exe (EMC) (PID=11632). Exchange Active Directory Provider could

not find an available domain controller in domain Domain.com. This event may

be caused by network connectivity issues or configured incorrectly DNS

server. This event may also occur if you have not configured correctly your

multiple Active Directory sites.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchange ADAccess" />
    <EventID Qualifiers="49156">2130</EventID>
    <Level>2</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-03-08T16:05:56.000Z" />
    <EventRecordID>89395</EventRecordID>
    <Channel>Application</Channel>
    <Computer>EXCH.Subdomain.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>mmc.exe (EMC)</Data>
    <Data>11632</Data>
    <Data>Domain.com</Data>
  </EventData>
</Event>

nourbenAsked:
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e_aravindConnect With a Mentor Commented:
The Exchange Management Console crashes when one or more domain controllers of a top-level domain are not reachable
http://support.microsoft.com/kb/957227

>>An Exchange administrator tries to create a new mailbox or checks existing mailbox properties in the Exchange Management Console.
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nourbenAuthor Commented:
Error on EMC
MXemcIssue.JPG
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dan_blagutCommented:
Hello

Under the Organization Configuration or Server Configuration node, there is a "Modify Configuration Domain Controller" context menu to launch the Configuration Domain Controller dialog. This allows you to specify a domain controller to be used for AD read and write for organization or server configuration.
Can you make sure that DC2 is NOT present there.

Dan
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AmitIT ArchitectCommented:
Run EXBPA and you can see the errors.
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e_aravindCommented:
what is the results\status of the event ID 2080 @ Application logs?
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