In any case, they are not needed for proper operation of Outlook itself. Whether those are needed depends on if and how you use that application. In addition, other Microsoft applications or 3rd party applications could add some add-ins to Outlook as well. Not all of them are activated and not all the ones which are activated by default are needed in every configuration. Outlook indeed already comes with its own set of add-ins. Which add-ins do I really need and which are safe to disable? I now try to “weed out” the additional add-ins hoping that it will improve my Outlook startup time as it is fast when launching Outlook in Safe Mode. I thought I was just using “plain vanilla” Outlook without add-ins but apparently Outlook already comes with some pre-installed and some others were added by installing other applications.
I checked the list of add-ins that I have installed for Outlook and I’m a bit surprised how many I have installed.