Is there a way to leverage the user information available from the admin console to generate reports?

Specifically, I'd like to be able to generate a report that lists the last login times for users.
The information is there, but requires you to look at each user profile individually.
It'd be real convenient to be able to export that type of info for all users accounts to a CSV file.

We've just set up Mobility service and, unfortunately, have a lot of accounts for former employees.
I'd like to avoid adding those users to mobility without having to check each-and-every account in the system.