Right, I should also calculate the difference between 1st and last login and respect it unless the users are disabled.
These users above are disabled, so they are save to delete.
I will add these columns to the HTML table.
The last login date was set to 2007-11-29/30 to everyone during an upgrade to SBS or Clearspace as far as I can tell.
I'm not sure about the 2008-* dates. Why would eg dulbayar register in 2001 and visit the community for 7 years without posting a thing?