My current customer had a little dabble in Office 365, they set up their Hybrid configuration and added their @xxx.onmicrosoft.com email alias to all their users and groups. This mostly happens automatically.
They then later decided to go with a new, different Office 365 tenant for production purposes, the old tenant was dismantled and the AADConnect server was deleted.
However, all AD objects still had their alias for the old Office 365 tenant, syncing that to the new tenant would be a bad idea and I cleaned that up just to be sure it wouldn’t cause trouble in the future, here’s how I did that:
O365GroupSync is a tool that I am building for a large global NGO, because AADConnect creates Read-Only objects in Office 365.
Read-Only objects cannot be edited in Office 365, thus users are unable to edit distribution lists in Office 365’s Outlook Web Accress (OWA) even if they are managers of said lists.
O365GroupSync was built to take over the synchronisation and initial seeding of all distribution lists, both ways, to allow users to edit distribution lists while in a hybrid Office 365 Exchange Online scenario, both on premises and in the cloud.
This beta version has been tested, but is not yet running in any production environments.
Are you using aadconnect, but want your users to be able to update your Office 365 distribution lists directly in OWA (Outlook Web Access)? And still keep them in sync with your Active Directory?