"From http://technet.microsoft.com/en-us/library/aa997145.aspx
a..
a.. To move contacts or distribution groups from one forest to another, you
must use a tool such as the Active Directory Migration Tool version 3.0
(ADMT v3). For more information about the ADMT v3, see Active Directory
Migration Tool v3.0.
"
no details given.
You cannot move the contacts by using the ADMT 3.0 because it is not provide
this function. If you want to move the contacts one forest to another forest
you should use Microsoft Identity integration feature pack...
Please see the below link..
http://technet.microsoft.com/en-us/library/aa996926(EXCHG.80).aspx
I have done it..
Regards
Muhammad Awais