Click "O" but Outlook does not open - the icon appears for a mili-second as normal but nothing happens. Other Office  programs W, P, and X all work fine. Running 2011, installed latest updates to 14.2.5 successfully without any issue, but still nothing. I presume installing the update would be like doing a re-install from discs. Reluctant to do full reinstallation in case I lose all my mail. Any suggestions please. Urgent!! Thanks (by the way, I installed an Apple Time Machine and did a full backup yesterday but used Outlook after this was done)