AD Cross Forest Migration from AD 2008 to AD 2012

Below Is the current scenario.

DC1: windows server 2008(Data-center) - primary domain
DC2: windows server 2008(Data-center) - backup domain

We need to do cross forest migration with windows server 2012.

Kindly suggest step by step guide.
rigelnetAsked:
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MaheshArchitectCommented:
You need to upgrade target domain to 2012 \ 2012 R2 1st, do not remove 2008 domain controllers from target \ source domains until your migration get finished
ADMT 3.2 does not support 2012 Domain controllers, you have to have at least 2008 R2 domain controllers to work with ADMT in target and source domain
http://support.microsoft.com/kb/2753560

AD upgrade
http://blogs.technet.com/b/canitpro/archive/2014/05/28/step-by-step-active-directory-migration-from-windows-server-2008-r2-to-windows-server-2012.aspx
http://blogs.technet.com/b/blainbar/archive/2013/06/11/upgrading-windows-server-2008-active-directory-to-2012-read-on.aspx

Then use ADMT 3.2 to do cross forest migration of users, groups, computers and servers and so on.
Domain controllers can't be migrated, they need to demoted 1st to member server and then need to migrated to target domain as member server only
Download ADMT Guide
http://www.microsoft.com/en-us/download/details.aspx?id=19188

If you have MS Exchange, the approach will change drastically
http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx

Please find attached Prerequisites document
C--Users-Administrator-Desktop-New-folde
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rigelnetAuthor Commented:
Thanks for the links. Its helpful for me.
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