[frustrated w/bb]

Seemingly overnight, I can't sync my Pearl Flip 8220 to my computer's Outlook anymore. BB software no longer reads my phone. I know my USB cable works, as I can still copy photos and videos to my computer. I am told to upgrade the phone's software, but I believe I already have the latest (4.6). I tried re-installing the BB software on my computer, and that does not work (have tried the newest and the version I have been using). Has anybody else had this problem? I hate to get rid of the phone because of this. Thanks!