How can I prune users that had not logged in for 3 month and have postcount 0?
ACP -> Configuration -> User Pruning
You can only prune users with 2 criteria (either or both, along with 'before x days registered'):
1. Postcount
2. Not activated account
However pruning with last login criteria can be easily implemented.
Thanks guys I have not realized that it can be done through pruning setting I use that feature to prune Prune unactivated users!