OK, SOLVED myself and posting here for reference
1) Before Migrating the IIS6 sites into IIS7, perform a MSDEPLOY archive for the Default site:
msdeploy -verb:sync -source:appHostConfig="Def
ault Web Site" -dest:archivedir=c:\archiv
e disableLink:ContentExtens
ion > msdeployarchive.log
2) Perform the IIS6 migration on the IIS7 server (
http://learn.iis.net/page.aspx/427/migrate-from-iis-60-to-iis-70/)
3) Sync (import) the Default site back into IIS7
msdeploy -verb:sync -source:archivedir=c:\arch
ive -dest:appHostConfig="Defau
lt Web Site" >msdeployarchive.log
Works GREAT, as long as you do not have a Default Web Site imported from IIS6.
Ken