Merging existing Windows/Exchange 2010 Forests into single Exchange organization

hello, this is a case of two companies merging so there are two completely separate Windows 2008 Domains/Forests (domain1.com and domain2.com) each with its own Exchange 2010 email (again domain1.com and domain2.com). We are keeping the existing servers & windows domains and want a single email domain for everyone. The new (additional) email domain is newdomain.com. We want:
1. each user to have an additional newdomain.com email address (i know how to do that and route email with connectors so that's not an issue)
2. single GAL that will include all users
3. sharing of Calendar free/busy information and delegation privileges across the organization.
I need insight in regards to steps 2 & 3 above. What's the best way to do that?
thanks
criskritAsked:
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suriyaehnopCommented:
For no.2 - since both are different Exchange organization, you can manually create a mail contact or can implement GALSync

http://social.technet.microsoft.com/Forums/exchange/en-US/46170918-5bc8-4407-8ea2-afc0a103e4d8/exchange-2010-gal-sync

http://technet.microsoft.com/en-us/library/aa998597(v=exchg.141).aspx

For no.3 - You can implement federation, http://www.stevieg.org/2010/08/federation-onpremise-outlooklive/
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criskritAuthor Commented:
In the past i have tried Federation while doing GAL sync with Quest. The problem was that Federation would get confused and try to delegate to the local stub accounts as opposed to the cross-forest user mailbox. Won't I have similar problem with manual contacts?

Also does FIM support GAL Sync? I am not familiar with that product.
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