Disabling unnecessary plugins is a great way to make your Outlook start faster, run more reliably, take less memory. In Outlook 2003 there are three places to look for installed addins and to disable them.
To view and disable COM Add-ins in Outlook 2003, navigate to:
“Tools->Other->Advanced Options->COM Add-ins…” and uncheck the Add-ins you do not need.
Navigate to “Tools->Options->Other->Advanced Options->Add-ins Manager…” and uncheck the Add-ins you do not need.