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Is it possilbe to migrate from 2003 Server-Standard 32-bit to a 2008 Server-Standard 64-bit. I'm not able to run the ADPREP from the 2008 disk without error.

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What specifically are you migrating? Files, Active Directory, SQL Server, Exchange, <other random LOB app>? – Ben Pilbrow Apr 15 '11 at 17:23
What error, specifically, do you get? If running from your Server 2003 machine, be sure to use the 32-bit version Adprep32.exe on the 2008 DVD. – jscott Apr 15 '11 at 17:25
Can you please also clarify if you're trying to upgrade on the same box, or migrate to another? – Ben Pilbrow Apr 15 '11 at 17:34

Windows will not upgrade from 32-bit to 64-bit, doesn't matter what version/edition.

You can run adprep32 with the Server 2008 (or R2) LDIFs and update the schema. Then install a 2008 Server somewhere, add AD, migrate the FSMO Roles, and decommission the original server.

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Chris is right. Regardless of which tools you are trying to run, it won't matter in the end. 32bit OS to 64bit OS simply isn't possible.

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