Exporting Mailboxes from Exchange 2007 to Exchange 2013

Hi, we are centralising a customer's e-mail system. There are lots of partner sites with their own Exchange servers. We'll be creating new mailboxes, on a new AD domain on one Exchange server and we need to migrate the email from the old mailboxes across. The originating server is Exchange 2007 and the new one is Exchange 2013.

Does anyone have any sure-fire way of doing this? In the past we have used ex-merge but that is clumsy and requires a 32 bit machine and has size restrictions. We have seen the New-MailboxImportRequest  command for Exchange 2013 so that may assist in the import process. But just wondered how other people have done this in the past.
Lee PepperDirectorAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
I suggest you do a crost forest migration with shared namespace. Please check this
http://msexchangeguru.com/2013/11/03/e2013crossforestmigration/comment-page-1/
Simon Butler (Sembee)ConsultantCommented:
Without third party tools, your only option is a 32 bit machine, with the Exchange 2007 management tools installed, plus Outlook.

https://technet.microsoft.com/en-GB/library/bb266964(v=exchg.80).aspx

Make sure you are using the SP3 32 bit installer files and Outlook 2007.

Getting the content in to Exchange is easy, using the command that you have identified.

Otherwise you are looking at third party tools and/or using the cross-forest techniques.

Simon.

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mac carterCommented:
Above suggested references looks good to get this job done. However, If you wish you may also have a look on below given informative post which might be helps you.

Mailbox import and export requests: https://technet.microsoft.com/en-us/library/ee633455%28v=exchg.150%29.aspx

Also have a look on this video which explains how you can export Mailbox data to a PST file using the enhanced Export-Mailbox cmdlet in Exchange Server 2007: http://www.msexchange.org/articles-tutorials/exchange-server-2007/management-administration/exporting-mailbox-data-to-a-pst-file-in-exchange-2007-sp1.html

Step-by-Step Exchange 2007 to 2013 Migration: http://blogs.technet.com/b/meamcs/archive/2013/07/25/part-4-step-by-step-exchange-2007-to-2013-migration.aspx

Hope it helps you!
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