Currently Being ModeratedApr 9, 2013 1:02 PM (in response to charlesfromcorrales)
Maybe settings have changed. Open Mail, go to the Mail menu (on the menu bar) > Preferences > General, and check the option you have selected to see the number of unread messages in the Dock icon
Currently Being ModeratedApr 9, 2013 1:10 PM (in response to mende1)
Everything looks normal there and it happened sudennly.