I'm sure everyone already found himself in this situation: 2 "unread posts since last visit", plus 4 pages of "All unread posts" and just when you are to click the "ALL UNREAD POSTS", you actually click the "MARK ALL MESSAGES AS READ".
This MOD will present you a confirmation box when you click the button "MARK ALL MESSAGES AS READ".
It does so in: - BoardIndex (main forum page at the bottom) - MessageIndex (list of topics inside a board) - Unread Posts / Unread Replies
There are no configurations necessary, those are just 4 "replace" operations and a new language string. This was tested in a clean 2.0.5 installation with default theme. Most themes do not change most of the files affected, but BoardIndex.template.php could cause conflicts with custom themes. If that's the case, please ask for advice.