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There is some information was missing. Finaly I got best guide and successfuly I migerate our server2003 Server to201264Bit.
Upgrade will not take place becouse OS Bit Version is different. Server2003 domain is running on32 bit & you want to upgrade on Server201264 bit version. So, yu will need to cleen installation if you required domain on server201264 bit.
I have find it for you
best of luck.....!
Many Thanks. Muhammad Tahir