I have a CSV file with a list of distribution groups from both the new domain and the old domain. They are mapped. The CSV file contains two columns (Source, Target). I'd like to copy the members from the source domain to the target domain. The members already have the proxy addresses from the source domain so it should be possible to match a user as well based on one of the proxy addresses. Has anyone done this and/or does anyone have a sample script to get me started? I'd like to do this in Powershell.