Pardon if this has already been suggested, if so. Please disgregard.

I am not a fan of the new Messenger at all. We have to now "leave" conversations which do not delete, atleast not on our case. Also, it's not very intuitive. You must select each message individually and then leave the conversation from there.

Is there an easier way to remove selective messages without having to empty the inbox, or leave each one.... one by one?

I´m really not a fan of the messenger myself, neither are my users. Hope to see the messenger reworked pretty soon because how it works right now renders it completely useless.

Our users actually are pretty happy with it. It reminds them a lot of social networking(Such as Facebook or twitter DM) and I have gotten a lot of positive feedback on it.

SO I am kind of hoping they don't rework/redesign it but I would not be opposed to a select all/delete all button.,

This should resolve your concerns (without giving away too much detail.) 

 

(There is a select all)