A reader asked how to move membership of multiple distribution lists from one mailbox to another. We use PowerShell to do the job. Only a few lines are needed to switch the memberships, but we add a few more lines to make the script work better. We don’t handle dynamic distribution lists. This is possible for precanned (simple) filters, but given the number of dynamic distribution lists usually involved, it’s probably best to update directory settings manually.
https://office365itpros.com/2021/08/04/how-to-move-distribution-list-membership-from-one-mailbox-ano...
