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exchange: flow mail between 2003 and 2010

Hi there,
I have start to migrate exchange 2003 to 2010 (Add one server with exchange 2010)
During the installation, I have defined unflow mail.
Does it mean that if I create one new user (peter) on the new exchanger server 2010, the exchange 2003 server follow  the incoming mail (from external organization and internal) for peter to peter ? And peter can send me to user who are on exchange 2003 server?
Thanks,
Regards,
Simlip
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simlip
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simlip
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R--RCommented:
once you strated the migration the emailflow between exchange 2003 and 2010 will will work.
What is unflow mail?
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R--RCommented:
While migration it will create a routing group connector between both the exchange server. Bu tthe incomming and outgoing mail outside the organization will work through exchange 2003. Once the mailbox migration is completed you have to point the firewall configuration to exchange 2010 so that the mailflow whrk through exchange 2010.

check this attachement from Milind Naphade.
rapid-transition-guide-from-exch.pdf
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
No ... depends how the mail flow works anyways if both these servers are in the same Exchange forest they should be able to work with a RGC created between them which will take care of the mailflow as of now

- Rancy
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