Which Outlook add-ins do I really need?

I checked the list of add-ins that I have installed for Outlook and I’m a bit surprised how many I have installed.

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 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.

Which add-ins do I really need and which are safe to disable?