Why is there a limit on how many messages - or maybe it's the total size - can be stored in any given sub-folder? T-bird's message is not enough space, try to empty the trash folder. I have plenty of disk space, so asking if T-bird has internal limits? I've always kept many messages, so any limitation is disconcerting. I can make more sub-folders, but maybe there's a limit on that as well? Should I be saving messages in the Archive/Local folders? Is there a section here for suggestions? I'd like to have an option to have just one Trash folders for all accounts. I'd also like to suggest a shortcut icon to go to next message, since the mouse is already in my hand.