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Migrating Exchange 2003 to 2013

I have a customer who is asking me to undertake an Exchange migration from 2003 to 2013. I have done a few migrations from 2003 to 2007 a few years ago so I will need some guidance and help with this.

What are best practices and some how to advice?  

Exchange 2013 will be hosted on Windows 2008 R2. A new server is on order and he is also open to using Windows Server 2012. The domain controller is a Windows 2008
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I agree, you have to migrate to 2010 first and then migrate to 2013.
And, be aware - Until Exchange 2013 SP1, there is no coexistance between 2013 and any other version, so you'll have to do an overnight kind of full cutover when you get to 2013 unless you wait 'till SP1 comes out (and if they come through with the coexistance model)
Wow, that's not a comfortable situation. We always leave both versions up for a week to make sure the servers and network stay stable. This is why we don't install the bleeding edge versions on our client's systems. We only install them on a test server.
MS announced the support/option for migration from Exchange Server 2007 or Exchange 2010 will be available on the first quarter of 2013.. and there is no option to upgrade from 2003 to 2013

you have to migrate exchange 2003 to 2007 or 2010 and from there you can migrate to Exchange 2013

that will be a complicated task... If your customer is rushing to upgrade to exchange 2013 and they have less number (say  25 or 50 less) of mailboxes... and if there are not using public folders

let me know, i will give a short route to take all mailboxes to exchange 2013.
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Yeah :) MigrationWiz helps you.. check with them whether they are supporting exchange 2003 to 2013
Do you have all clients on Outlook 2007 or higher? If not then you will have to do that first.

My preference would be to migrate from Exchange 2003 to 2010, which is very well documented and known procedure. Then remove Exchange 2003. That will give you some breathing space rather than being one of the first to migrate to Exchange 2013. Buy Exchange 2013 licences, and then use downgrade rights to install Exchange 2010.

Then once the mgiration guides from Microsoft and third parties are released you can follow tose, but in a lot more controlled manner. No third party tools will be required.

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I will use and since I found it myself I will close this question
Have you tested any of these migration tools in a production site so far?