To change the default for future users, update the prefs.cfg (display => msgs_per_page) file that's in the template directories. To change existing user's preference, you can try using the change_prefs.pl script that was added in 3.0.1. ./change_prefs.pl display.msgs_per_page=50 should do the trick. As for existing folders, it is set in each user's individual folder in the folders_per_page option. You could update it with a single SQL query such as: "update gmail_folders set folders_per_page = 50 where folders_per_page = 25"

Note that all these changes will overwrite the user's previously chosen settings.

Adrian