Exchange 2007 The exchange server address list service failed to respond. After Upgrading Domain Controllers to 2008 R2

I want to creat a new mailbox for a new user. But i get the following error: The address list service failed to respond.
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Solution:
Go to Organization Configuration in EMC. Right click it in EMC and select Modify Configuration Domain Controller. Point it to your DC hosting the PDC

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After that restart the Exchange System Attendant services on the mailbox server.

The Microsoft Exchange System Attendant Service does the following thing:

Forwards directory lookups to a global catalog server for legacy clients, generates e-mail addresses and offline address books, /busy information for legacy clients, and maintains and memberships for the server. If this service is disabled, any services that explicitly depend on it will fail to start.

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