I used to spend a good 10 minutes each day in my Blackberry message folder navigating from one message to the next (press N to move to the Newer message or press P to move to the Previous message) so that the read/unread status would match my computer-based email applications (Mac Mail and Gmail).
Now, I've discovered I can mark whole days' worth (if not weeks' worth) of messages as opened by doing the following:
- In the Blackberry Messages folder, scroll down until you've highlighted a date separator
- Click the scroll wheel to bring up the popup menu
- Select "Mark Prior Opened" and all the messages received that day (or any day prior) will be marked as opened and your unopened messages ticker will decrease in size accordingly!
PS from what I can tell scrolling through the Crackberry Forums, this shortcut works on all Blackberries.