Deleting non-active users (e.g., users who didn't log in for 90 days) We use Drupal as an employee portal; as such, when new starters join the business they create an account.

However, we are trying to figure out a good leaving process; right now I get a list and have to manually delete all the users.

Ideally, we would like something which send an email to a user after 14 days and then again after 30 days informing them that they have not logged in into the system; then, after 60 days, they are automatically deleted.

I am guessing that using Rules is the answer, but I cant find any option to delete users.
Maybe this module can help: inactive user

From the module page:


  After configurable periods of inactivity, one or more of the following
  actions can be automatically taken:
  
  
  send an email to the user  
  send an email to the site administrator(s)
  block the account (a warning can first be issued)
  optionally notify user and/or site administrator(s) that account
  was blocked  
  delete the account (a warning can first be issued) 
  optionally notify user and/or site administrator(s)1 that account was
  deleted