I have had some success in further troubleshooting of Outlook 2003. The culprit with Outlook 2003 running very slow and swamping the system at 100% CPU usage is with one of the three email accounts I had set up with it. I deleted the email account entirely, and now Outlook 2003 runs smooth as a whistle with very low CPU usage. But does anybody know why all of a sudden that email account started messing up Outlook 2003? I tried adding it back as a new email account, but it keeps telling me the following error when I TEST THE SETTINGS: Log onto incoming mail server (POP3): Outlook could not connect to the incoming mail server (POP3). The problem could be your SSL or port settings for the incoming server. Verify your port and SSL settings under More Settings on the Advanced Tab. I have done this, and called the folks who handle that email server to verify I have the correct settings, but still get the above error. Also, when I attempt to re-add the email account, CPU usage climbs to above 50-60%, and Outlook 2003 no longer runs as smoothly.