Warning when creating GAL from Exchange 2010 SP2 Shell

When creating a GAL from Exchange 2010 SP2 Shell (New-GlobalAddressList) I got the following warning:

WARNING: One or more global address lists were missing from the Active Directory attribute.  This is likely caused by using legacy Exchange management tools to create global address lists

Cause: you get this warning if this is the first new GAL created from 2010 or there are 2007 created GALs. This is 'by design' and can be ignored.