User Prune

Drupal 7 version:
User Prune lets you mass delete inactive users based on criteria you specify.

The pruning specification you select can be saved as a cron job, or executed a single time.

The main criteria is the time since the user last logged in or, if never logged in before, the time since the user was created.

Optionally, some criteria can be set to Prune users:

• by status (blocked or active)
• by roles
• who never posted comments
• who never created nodes

Drupal 6 version:
User Prune lets you mass delete inactive users based on criteria you specify.

The module classifies inactive users into two categories: users who have never logged in before, and users who have logged in at least once.

For users that have never logged in before, you can choose to prune users based on how long they've been registered.

For users that have logged in before, you can chose to prune users based on both how long they've been registered, and how long its been since they last logged in.

The pruning specification you select can be saved as a cron job, or executed a single time.