Hi MSOffice community,

after stumbling over this problem a few times already, I finally decided to solve this once and for all. It seems simply not possible to remove duplicated participants out of conversations in Outlook straight forward and out of the box. I found a few workarounds or payed solutions ... but nothing really satisfying.
So I've decided to write my first Office plugin to target this problem. The first version is now ready to be used.

Maybe some of you are also interested in, so I've decided to make it public. You can find it here:
GitHub - Fruchtzwerg94/OutlookRecipientCleaner: An Outlook Add-In to clean up duplicated Outlook recipients

Maybe it's also a nice little helper for some of you. Feel free to give me your feedback. Have fun with it.

Cheers,
Philipp