There used to be a report somewhere in the Google apps admin interface that allowed you to draw down a report of all aliases registered to users, but I just can't find it anymore.
I did find references to using the Google Apps shell, and a GUI written in Python called "gasi", but I'm getting nowhere fast with that approach.
I need to have an export of all of these aliases, so that I can be sure they are all matched up in our new Office 365 account so that none will be missed when I switch over (hopefully tonight).
If anybody can direct me to where that report lives now, or some way to extract that list via API, I'd greatly appreciate it!!!