Urgent help: gal sync 03 & 07

Hi all,

Forest A has exchnage 2003 and forest B has exchange 2007

From my test, When I create forest A (a.com) GAL MA and create forest B
(b.com) GAL MA,

when I run forest A GAL MA export, it will export forest A users to forest B
as contacts (contact's primary email address is a.com). If I run the two
powershell script (Get-EmailAddressPolicy | Update-EmailAddressPolicy
Get-AddressList | Update-AddressList ) in the forest B exchange 2007 server,
will it change these contacts (from forest A) to b.com?

Here are profiles running order: (forest A has exchange 2003 and forest B
has exchnage 2007)

Forest A GAL MA full import (staging only)

Forest B GAL MA full import (staging only)

Forest A GAL MA full synchronization

Forest B GAL MA full synchronization

Forest A GAL MA export

Forest B GAL MA export

Forest A GAL MA delta import

Forest B GAL MA delta import

In the above steps, after which step I need to run two powershell scripts
Get-EmailAddressPolicy | Update-EmailAddressPolicy
Get-AddressList | Update-AddressList)

I greatly appreciate your help.

Thank you.