Outlook 2010 and Outlook 2013
- File-> section Options-> section Add-Ins
- At the “Manage” dropdown list at the bottom select which type of add-ins you would like to enable/disable
- Press “Go…” and make the changes
- For some add-ins you’ll need to restart Outlook for changes to take effect.
Note : If you get the error “The connected state of Office Add-Ins registered in HKEY_LOCAL_MACHINE cannot be changed.”.
You certainly do not have all add-ins enabled for Outlook to work properly. Disabling unneeded add-ins can actually speed up Outlook as well.
MCTS | Exchange Server