decommisioning exchange 2007

Hi Guys, I was given a task to migrate exchange 2007 to exchange 2010.
my scenario is

I have an existing exchange 2007 server onsite.
I have prepared and a new server currently onsite with exchange 2010.
when you open up EMC the mailbox is there. basically I Have two exchange server
onsite and not sure what to do next, what to do with the database

I would like to know what is the steps to totally take Out the exchange 2007 server onsite and have them use the new server.  your advise to this matter is highly appreciated.
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Chris MillardCommented:
There are multiple possibilities for this - for example, you could look at simply moving the databases from 2007 to 2010, or you could move mailboxes from 2007 to 2010.

How many mailboxes do you have?
mod2incAuthor Commented:
Hi Thanks for the reply,

I have 45 mailboxes.

database is at 150GB.

The exchange 2010 already has the list of mailboxes showing in the EMC.
any advise how to move the database or maybe links of useful information?
I QasmiTechnical LeadCommented:

check out this migration guide on petenet , it contains all the steps before moving on

Also check the recommendations mentions in this article :

The sequence for a migration from Exchange 2007 to Exchange 2010 is as follows:
Upgrade all Exchange Servers to Exchange Server 2007 Service Pack 2.
Bring the AD forest and domains to Windows Server 2003 Functional (or higher) levels.
Upgrade at least one Global Catalog domain controller in each AD Site that will house Exchange Server to Windows Server 2003 SP2 or greater.
Prepare a Windows Server 2008 (RTM or R2) x64 edition server for the first Exchange 2010 server.
Install the AD LDIFDE tools on the new Exchange 2010 server (to upgrade the schema).
Install any necessary prerequisites (WWW for CAS server role).
Run setup on the Exchange 2010 server, upgrade the schema, and prepare the forest and domains. (Setup runs all in one step or separate at the command line.)
Install CAS server role servers and configure per 2010 design. Validate function-ality.
Transfer OWA, ActiveSync, and Outlook Anywhere traffic to new CAS servers.
Install Hub Transport role and configure per 2010 design.
Transfer inbound and outbound mail traffic to the 2010 HT servers.
Install Mailbox servers and configure Databases (DAG if needed).
Create public folder replicas on Exchange 2010 servers using AddReplicatoPFRe-cursive.ps1or Exchange 2010 Public Folder tool.
Move mailboxes to Exchange 2010 using Move Mailbox Wizard or Powershell.
Rehome the Offline Address Book (OAB) generation server to Exchange Server 2010.
Transfer all Public Folder Replicas to Exchange Server 2010 Public folder store(s).
Delete Public and Private Information Stores from Exchange 2007 server(s).
Uninstall all Exchange 2007 servers.

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