A common problem when creating just about any resource in Active Directory, Exchange Online, Azure AD, SharePoint, etc. is life cycle. I see so many customers that have no control over their distribution groups. This is a script that you can use to determine which if your distribution groups are in use, and which are not, by looking at the message trace for the last
This year one of the projects to my team is an AD and exchange review and clean up. One of the items we will use to review distribution list is this script.