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Cross Forest Exchange 2000 to 2010 do I need to upgrade the source to 2003 first?

I have an enviorment with a source domain of Exchange 2000 and Windows 2000 AD.
I need to move them into a target forest of Windows 2008R2 and Exchange 2010 Sp1.

I was trying to use the quest tools but I am running into an issue and can not get support on it.

I am thinking can I just add a 2003 DC to the original domain and install 1 Exchange 2003 exchange server.

Then move the users from 2000 to 2003 then across to Exchange 2010 with a move request one at a time? Or do I need to completely remove Exchange 2000?

All of the users have been moved with ADMT with Sid history.

There is only about 20 Gigs of mail.
I know I can use interorg replication  for public folders
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brota
Asked:
brota
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1 Solution
 
AmitIT ArchitectCommented:
Yes, you need to upgrade it to Exchange 2003 first and Windows 2003 AD SP2.
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brotaAuthor Commented:
even for cross forest?
I know I need to have atleast 1 Global catalog
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AmitIT ArchitectCommented:
Yes...that is true...you cannot transition from 2000 to 2010...you need minimum 2003 Exchange env. And Exchange has to be 2003 native with AD 2003 functional level.
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brotaAuthor Commented:
What if I completely remove 2010 from the domain then install 2007 first?
I cant move the old domain to 2003 native mode for AD
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AmitIT ArchitectCommented:
AD requirement is same for 2007 and 2010...better to upgrade to 2003 exchange...which is inplace...later you can change it to native mode...both for AD and Exchange....if this is only server you have...then i don't see any big deal.
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AmitIT ArchitectCommented:
One more thing...i forget to add...after extending the schema for 2010...you cannot install exchange 2007 anymore...there is no reverse steps...so you need to plan properly before moving to 2010.
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brotaAuthor Commented:
I do know 2007 can talk to a mixed mode domain as long as 1 GC is 2003 SP2
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AmitIT ArchitectCommented:
Just check the link first...and see the possibilities given in that link
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brotaAuthor Commented:
I did but I am talking about doing a cross forest migration.
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AmitIT ArchitectCommented:
It talks about the cross forest migration only. Whether you do transition or migration...minimum requirement in Exchange 2003 sp2 with native mode and AD 2003 sp2 with 2003 as functional level.
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brotaAuthor Commented:
according to here
2000 to 2007 can have a 2000 box as the source exchange server

http://blogs.technet.com/b/exchange/archive/2006/11/02/3396084.aspx

I am debating on ripping out the 2010 and reinstalling 2007 to do the migration
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AmitIT ArchitectCommented:
If you haven't extended the schema for 2010...you can go with 2007 plan.
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brotaAuthor Commented:
I am going to remove the 2010 through adsiedit
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brotaAuthor Commented:
I would prefer to put a 2003 dc and 2003 exchange in the old enviorment then do the move to 2010 but I cant get any confirmation that I can get it to work
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AmitIT ArchitectCommented:
As I mentioned already, once you have installed Exchange 2010...you cannot have 2007 anymore.
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AmitIT ArchitectCommented:
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