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.
1. COM Add-ins
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.
2. Add-in Manager
Navigate to “Tools->Options->Other->Advanced Options->Add-ins Manager…” and uncheck the Add-ins you do not need.
3. Registry Add-ins
In Outlook 2003, some Add-ins are not shown in the UI. You have to look for them in the registry.
- Run regedit*.
- Navigate to “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ Outlook\Addins”.
- Look at all subkeys of Addins. Those are Add-ins you have installed. To disable a particular Add-in, set its “LoadBehavior” key to 2.
* – as always be very careful while performing registry modifications.
Do not forget to restart Outlook after making these changes.