Get rid of unread message icon
Saved Messages
According to the article, most of the unread messages should be in “Saved Messages” folder.
Lookup for unread messages
– Go to Messages
– Open the menu
– Select ‘Search’
– Do not fill in any search terms
– Click on the menu and hit ‘search’ again
This will bring up ALL messages on your Blackberry – phone, email, wap, whatever, phone calls
– Hit ‘u’ and you’ll find all the unread messages.
Mark Prior Opened
– In Messages, highlight the date and click “mark prior opened.” If that doesn’t do it then you likely have saved messages as posted about above.
– While in Messages click the trackwheel and select “View Folder”. Then check the saved messages folder. You can do the “mark prior opened” in there too if there are a bunch of messages there.
– Also in that same View folder menu check “Missed calls” and “Phone call Log” folders and do the same “mark prior opened.” If you like you can do a “delete Prior” as well.
Source :
http://www.blackberryforums.com/rim-software/11975-cannot-clear-unread-messages-1-message-remains.html
http://forums.crackberry.com/f49/unread-message-indicator-3587/