Suddenly, I stopped receiving desktop alerts/notifications for new emails. I still get them for Calendar events/reminders though.

I double checked my Preferences, those are correct. I tried to Reset my alert dialogs, that didn't help either. I also came across a post that suggest to do step #4 from this article:  http://support.microsoft.com/kb/2409331

I also made sure that they weren't showing up on a different desktop, and they aren't. I also haven't installed any new programs.

Please help... Thanks!