Cloud based email and distribution lists

The company I work for recently switched from an Outlook Exchange based email system to a cloud based system. This happened just before I joined the team, so the switch shouldn't really have affected me.

 

I have been using cloud based email on a personal basis for a while, now, so I didn't really expect to encounter any challenges. But distribution lists have got me (a bit) beat at the moment. I don't use those for my personal emails.

• I have yet to figure out how to create a distribution list of my own - any help on this front would be welcomed.
• The distribution lists from the Outlook system have either been carried over or recreated (I'm not sure which), so I can use those to send out group emails. Being fairly new to the company, I don't know who is included on the various distribution lists, and I have yet to find a way to expand an existing distribution list to find out who's on it. Once again, any help you can offer...
• When I send out a meeting invitation to one of the distribution lists, the invitees are unable to respond. They receive an error message to the effect that the invitation has been sent to , whereas they're logged in as . So in fact, meeting invitations have to be sent to a list of individuals, rather than a named distribution list. If the distribution list is long and/or if you don't know who's on it, this can be problematic!

Have you had similar challenges? How have you resolved them?