Not sure how this happened all of a sudden, ... but here's the situation: Using Windows Vista & Outlook 2007. Built new machine about a month ago. Installed Vista and Outlook 2003. Then, upgraded to Outlook 2007 about 2 weeks ago. Everything was working fine until yesterday. Now, my CPU usage has been spiking a lot, and the system tray shows that Outlook is constantly "synchronizing folders." I turned-off the RSS feed, and I am not connecting with an Exchange server (only POP3). Any Ideas? Is this a Vista problem? ... Outlook?