A rough body count based on Sancus' data from early this year. 1050 total count 63% < 1k users  ( < 0.01% of the user population) 31% < 100 users 25% created 2007 or before (260), i.e. before the era of mozillamessaging [1] - of those, 50% have not been updated since 2009-01 75% created after 2007 (790) [2]  - of those 25% (210) have not been updated since 2010-01 [1] selected examples created prior to 2008 - contacts-sidebar, enigmail, quote-colors, remove-duplicate-messages [2] selected examples created 2008 and later -  compactheader, account-colors, get-partial-messages, subswitch, manually-sort-folders