Exchange Resource forest (2007) to new forest

I have a global client. They have 2 forests: xyz.com and 123.com. In xyz.com, they have 2 exchange 2007 servers (1 in US and 1 Over seas). The users in 123.com are using LINKED mailboxes in xyz.com (resource forest) and again don't have their own exchange server. All works great! The goals are:
1. Move to Exchange 2010
2. install Exchange 2010 in 123.com and moved linked mailboxes to their own forest.

Thoughts? Not used to working with resource forests... I have set them up but not migrated them...
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Alan CoxSr. Systems Engineer | Lead Microsoft CIE Qualified FacilitatorAsked:
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Larry LarmeuPrincipal ConsultantCommented:
You can do this pretty easily as long as the proper permissions are set by doing a Remote Mailbox Move Request within Exchange 2010.
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Alan CoxSr. Systems Engineer | Lead Microsoft CIE Qualified FacilitatorAuthor Commented:
so should 1st forest be moved to 2010 first, or introduce a 2010 in 2nd forest and do remote move request?
Then moved linked mailboxes and connect them to users in the 2nd forest (123.com)? What about the disabled accounts in resource forest?
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Larry LarmeuPrincipal ConsultantCommented:
You can do it either way - You can move the accounts across forest and across version if you use the -RemoteLegacy switch.  As far as disabled accounts, you just have to decide if you want to move those, leave them, or delete them.
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