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Unable to create mailbox in Exchange 2007

Hello all,
Q #1) I am attempting to create a new mialbox & a new user account thru the Exchange 2007 Management Console. I am getting the error message below. This Exchange 2k7 server is installed in an existing Exchnage 2k3 organization. I am doing some preliminary testing for am upcoming "transition" to Exchange 2k7.
Not sure what's the problem.

Q #2) Can you steer me towards a comprehensive transition plan for Exchange 2k3 to Exchange 2k7. It seems like there are lots of little gotcha's, but Microsoft transition articles do not even address these issues.

Access to the address list service on all Exchange 2007 servers has been denied.

Exchange Management Shell command attempted:
Enable-Mailbox -Identity 'domain.org/Teams {(SDI) }/Developer Support/Users/John Doe' -Alias 'JDoe' -Database 'CN=Mailbox Database,CN=First Storage Group,CN=InformationStore,CN=SDI-ES1,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=XDE3,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=xde3,DC=domain,DC=org'

Elapsed Time: 00:00:00

1 Solution
check to make sure the system attendant service is started. if it is started, restart it.

Layer8GroupAuthor Commented:
I verified that ithe System Attendant service is running.
Layer8GroupAuthor Commented:
It has been re-started. I actually rebooted the server about an hour ago
NFR key for Veeam Agent for Linux

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Layer8GroupAuthor Commented:
It turned out to be a delegation of control for the organization. I added my account to the appropriate group, and problem solved. Thanks  
no problem glad u sorted it
I would weigh-in on Q2.  What I have done in the past is take a utility from Vmware like vmserver and setup a DC, an Exchange 2k and 2k7 server and a client in a virtual network.  

Or you can use vmconverter which is currently free.  You can take a hot copy of a Domain controller, your current email server, your new mail server and some workstation or client and built an very good test environment in VM.  The free tools can do all of this.  You would need a workstation with a few GB's of RAM and as much disk space as it would take to make your copies of your live servers.

You can read about the tools at VMwares website.  In either case you will have a very good test run at the upgrade.  The latter of the two ways should shake out any issues you will have in your live environment.  I am happy to elaborate on any of this.


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