Mobile accounts not expiring

Hi everyone,

We have all of our Macs (running 10.7) bound to AD through the native plugin. We have the AD plugin set to create mobile accounts. We create three local groups on each machine and add the equivilent AD groups to the local groups. For instance, we have a local group called Students which has the member DOMAIN\AD Students. We then use local managed preferences to launch a login script to map drives for these accounts, which works correctly based on group membership.

We've now set these same three local groups to have mobile account expiration. On a test machine, we set it to 2 days. We then logged in with a test account and rebooted, logged in again, and rebooted. After waiting all week, the account is still there (along with all of the other mobile accounts, but we don't know exactly when those students had logged in).

Is there any place to check where the last time a user logged in? Does our setup sound like it should even work?

Thanks!

-MRCUR