Domain migration: From single domain to Multiple

Hi ,
We have an urgent requirement for the domain migration
The scenario is currently we are using MS AD as LDAP server to store portal users and thier credentials.
Lets say we have current domain name as : ad.abc.com
we are planning to migrate from this domain to number of domains.our requirement is to move the portal users into thier specific domain in batches.eg out of 5 users 2 has been moved to new domain and other 3 are still in ad.abc.com.
But after domain migration ,all the 5 users should be able to access all the applications and functionality of portals.
What should we do to achieve the same?
How portal applications will be affected by this?Can all the users access all applications without fail?
What exactly the LDAP does in portals?
Any help will be greatly appreciated
Thanks in Advance
Amit

Hi,
Yes, you need to prepare Active Directory and domains.
What's more, you need to upgrade existing Exchange 2007 servers to Exchange 2007 Service Pack 2 at least.
Here is an article for your reference.
Exchange 2007 - Planning Roadmap for Upgrade and Coexistence
http://technet.microsoft.com/en-us/library/dd638158(v=exchg.141).aspx
Hope it helps.
Best regards,
Amy
Amy Wang
TechNet Community Support

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