Disabling unnecessary plugins is a great way to make your Outlook run smoother. In Outlook 2007 Add-ins are listed under “Tools->Trust Center->Addins”. There are two types of Addins – COM Add-ins and Exchange Client Extensions.
Disable COM Add-ins
To disable COM Add-ins:
- Select “COM Add-ins” in the Manage drop-down at the bottom of the Trust Center window and click “Go”.
- Uncheck any add-ins that you are not using.
Note: If you see “The connected state of Office Add-ins registered in HKEY_LOCAL_MACHINE cannot be changed” see this article for help with disabling those add-ins.
Disable Exchange Client Extensions
Exchange Client Extensions are a different type of Add-ins. To disable those:
- Select “Exchange Client Extensions” in the Manage drop-down at the bottom of the Trust Center window and click “Go”.
- Uncheck any add-ins that you are not using.
Do not forget to restart Outlook for changes to take effect.
See more tips on improving Outlook performance and stability.

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