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<H1>Interforest migration</H1>
<P>Active Directory Migration Tool can be used to migrate users, groups, and computers between Windows NT domains and Windows 2000 domains. The process of migrating users, groups, and computers is referred to as <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=DomainMigration">domain migration</A>.</P>
<P>An <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=InterforestMigration"> interforest migration</A> is any move from a domain outside of a particular <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=forest">forest</A> to a Windows 2000 domain inside that forest. Because Windows NT domains are not part of a forest, migrating users, groups, and computers from a Windows NT domain into a Windows 2000 domain is considered an interforest move.</P>
<span class="webonly"><A ID="thumbnail" TITLE="Enlarge figure" HREF="CHM=DomainMig.chm FILE=admt_01.gif">Interforest migration flowchart</A></span>
<span class="printonly"><img src="admt_01.gif"></span>
<P>As shown in the illustration, moving <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=SecurityPrincipal">security principals</A> or resources from any of the domains on the left of the forest boundary (<A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=SourceDomain">source domains</A>) into any of the domains on the right (<A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=TargetDomain">target domains</A>) is an interforest move because the source and target domains are not in the same forest.</P>
<span class="webonly"><A ID="thumbnail" TITLE="Enlarge figure" HREF="CHM=DomainMig.chm FILE=Interforest.gif">Interforest migration flowchart</A></span>
<span class="printonly"><img src="Interforest.gif"></span>
<P>Most organizations that are currently using Windows NT have <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=AccountDomain">account domains</A> and <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=ResourceDomain">resource domains</A>. As shown in the illustration, the steps to perform an <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=InterforestMigration">interforest migration</A> include migrating the user and group accounts in the account domains; migrating the service accounts, local profiles, and <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=SharedLocalGroup">shared local groups</A> in the resource domains; and then updating the rights of the migrated users. When the migration is complete, the <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=SourceDomain">source domains</A> can be decommissioned, and the computers can be moved into the <A ID="wPopup" HREF="HELP=ADMTGlos.hlp TOPIC=TargetDomain">target domain</A>. Essentially the same steps can be used to migrate Windows 2000 domains from one forest into Windows 2000 domains in a different forest.</P>
<P>For information about preparing domains for migration, see <A HREF="admtsystemreq.htm">Migration requirements</A> and <A HREF="admtbeforeintermig.htm">Before performing an interforest migration</A>.</P>
<P>For details about migrating domains between forests, see <A HREF="admtinterforestacctmig.htm">To perform an interforest account domain migration</A>, <A HREF="admtinterforestresmig.htm">To perform an interforest resource domain migration</A>, and the <A ID="extUrl" HREF="http://www.microsoft.com/isapi/redir.dll?prd=Domain Migration and Restructuring tools" TITLE="http://www.microsoft.com/" TARGET="_new">Microsoft Web site</A><SPAN CLASS="printOnly"> (http://www.microsoft.com/)</SPAN>.</P>
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