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Exchange 2003 to Exchange 2010

I don't know if I am over complicating this or over simplifying but I am in the process of upgrading exchange 2003 to exchange 2010. I am following the Deployment Assistant that is part of the Exchange 2010 installation. I have gotten to the "Move Mailboxes" section and struck by fear I have stopped. Here are some questions I have that the Deployment Assistant doesn't tell me.

1) After I move the mailbox's does exchange automatically know that the new server is now THE mail server and all email should come and go from the Exchange 2010 server as apposed to the old 2003 server?

2) When I add a user to active directory I was always prompted to add an exchange mailbox. Does Active Directory now know to add that mailbox to the new 2010 Exhange?

3) We use Postini. In our current Exchange 2003 configuration I have the Postini IP range set up under the Default SMTP Virtual Server as allowed to access the virtual server. I then have a policy on our firewall allowing traffic in on port 25 and then forwarded to the Exchange 2003 server. Am I correct in believing all I have to do in Exchange 2010 is enter the Postini IP range under Hub Transport receive connectors and then forward the policy to the new Exchange 2010 server and I magically will start receiving email?

Any help talking me down off the ledge here would be greatly appreciated.

Thanks
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clifford_m71
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clifford_m71
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Glen KnightCommented:
A1 > yes outlook will automatically update iself.

A2 > you need to use the Exchange Management Console to create the mailboxes, you will get an option to create a new user at the same time.

A3 > Correct, but you will need to remove the configuration of the Default SMTP Virtual Server otherwise the 2003 server will not be able to communicate with the 2010 server.  See my guide here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_3044-Exchange-Server-Mail-Flow.html
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Glen KnightCommented:
Oh and in the receive connector don't forget to enable anonymous users otherwise you won't be able to receive mail unless postini authenticates first.
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clifford_m71Author Commented:
demazter,

Thanks for the quick response. Can you clarify 2 of your answers for me.

A2) When you say I will  "get an option to create a new user at the same time" do you mean that as I create the new user in Active Directory I will be prompted to add the mailbox in the Exchange Management Console?

A3) I'm not sure what  "Remove the Configuration" of the Default SMTP Virtual Server means. Do you mean stop the server?

Thanks
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Glen KnightCommented:
A2, no, in the Exchange Management Console when you create a new mailbox you will use the option to select an existing user or create a new one.  You can no longer create Mailboxes using Active directory Users and Computers.

A3 > The default SMTP Virtual Server needs to be reset to vanilla settings otherwise the exchange 2003 server will not be able to communicate with the 2010 server.  So if you have relay restrictions and smarthost configured here this needs to be removed (detailed in my article posted above)
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clifford_m71Author Commented:
Last question before I take the plunge. Any guess on how long it will take to move approximately 70 mailboxes with an of *edb size of 44GB? Is it something I can do over night?
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Glen KnightCommented:
Yes, althought I would personally want to leave it over a weekend just incase.
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clifford_m71Author Commented:
OK demazter. I will give it a go this weekend and report back here on Monday. Thanks for all your advice.
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clifford_m71Author Commented:
Thanks for the help. All went perfect....can't believe it.
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