For those companies moving from Exchange 2003 to Exchange 2010, using groups to manage a particular distribution group membership is no longer an option as that feature was removed from 2010. Microsoft has provided an 'as is' script to use as a workaround but why they felt it was ok to ship 2010 without this feature is crazy. I understand the technical reasons but they should have resolved those before shipping as this is a basic feature.
The push for new features is great but that has to be balanced with providing a solid platform with all basic
functionality intact. Now E15 is coming and many admins are still struggling with the upgrade to 2010.