I do not have an instance to test, but you can create an O365 list in minemeld:
In the past I have used the API and a powershell script to pull the list from Microsoft and create a dynamic address list from that, here are a few articles to point you in the right general direction:
A smiliar strategy could be used to dump the list to an EDL if you have somewhere available to host it.
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!