I have recently taken over as admin for a company. One of my first tasks has been to clean up the active directory, I have user accounts that haven't been disabled, groups and users in lots of OU's for no reason. Frankly it is just messy. One of the things that has me stumbed is the double groups. For example I have "Real Estate Global" group with users and a "Real Estate" group with the only member is the "real estate Global" group; and there is a " Reception Global" group with users and a "Reception" group with only the "Reception Global" as a member. There are a few of these:
From what I can see there are no GPO or security settings for this, why would it be set this way?