We're using LDAP as our source for users. This works fine, and everyone can simply log in using their LDAP info, and it will create a Drupal user for that person. However, one of our requirements is having a (searchable) list of users on the site. This means that we regularly need to check LDAP for new and changed entries, and merge them with our drupal users.
The LDAP for Drupal 7 module has a list of events that trigger LDAP provisioning. One of them says:
On cron runs. Not implemented yet. I haven't found anything about the state of this, as this is basically what we need.
Because of problems in migrating our website to new versions, we're currently trying to rewrite everything to use community modules. Therefore, we'd very much prefer an official solution. We've currently switched the user list to a LDAP query view, but this is only a temporary solution.