Can the Exchange 2007 AD groups (e.g., Exchange Organization Administrators, Exchange Public Folder Administrators, etc.) be removed after Exchange 2010 is up and running and all of the 2007 servers have been removed assuming the members have been properly assigned to the new Exchange 2010 groups?

Hi, No, you cannot remove these groups, because Exchange 2010 security groups just contains the previons exchange gourps as the members, it does not assign the permission to the members in the exchange 2007 AD groups. For exmaple, the Exchange 2010 group "Public Folder Managment" has a member "Exchange Public Folder Administrators". So the members of "Exchange Public Folder Administrators" are able to manage public folders and databases on servers running Exchange 2010. If you remove the "Exchange Public Folder Administrators", these users will be unable to manage public folders. You have to manaully add these users to the "Public Folder Managment" group.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT

What if the members of "Exchange Public Folder Administrators" also becomes members of "Public Folder Managment" wouldn't it be possible to delete the Exchange 2007 groups?