We have an active Office365 subscription, and yesterday I enabled Azure AD sync but now our Mail-enabled GROUPS are not being received by any client.
I uninstalled the sync-tool on my onPremesis DC but SYNC is still active in my Azure Portal. I want to undo everything so hopefully I have my mail back that has been send to the groups.
Simply disable DirSync in the tenant, all accounts will change to "cloud only" in few hours (max 72).