Outlook Category in Thunderbird

is there any extension or a build in feature to show and use Outlook category in Thunderbird?
In Outlook we use a category to tag mails and sort them by category.
Not all user have Thunderbird and so I need a solution to use the outlook category for mails in thunderbird too.

Thanks for any hint.

Hello gieri. I suggest posting your ideas at https://connect.mozilla.org/t5/ideas/idb-p/ideas where they can be discussed and voted.