2 companies share 3 domains and should be kept separate most of the time for distribution lists etc.
It is clear we have users from company a in company b’s lists which is wrong.
We are talking about 100’s, if not 1000’s of lists here.
I need to be able to search all 3 domains lists (and mail enabled security groups) with @company email address for any @companyb UPN and export the lists with members to review as a few may actually need to be a member.
Once reviewed, then remove the x users.
What’s the best way of doing this?