[bsoule]

Gmail is a bit inconsistent about that by default: it shows you the number of individual unread messages, and then the total number of threads, so you can't use subtraction to get an accurate read count. GmailZero gives the number of fully read threads (unless you have a really huge inbox, in which case it counts the bare read msgs until you get down) -- so if a thread has an unread msg it goes back to an unread thread and doesn't count against you.