[HenryMulligan]

"EliteBook trackpoints never had a middle button."

That is not correct. My old HP EliteBook 8560W had not one but two sets of three mouse buttons. See the first image at this article: https://notebooks.com/2011/04/12/hp-elitebook-8560w-details-...

[scrlk]

I should have been clearer. HP's mainstream business laptops never had the middle mouse button whilst their workstation laptops (such as your 8560W) have always had them.

[HenryMulligan]

Okay, fair. Thank you for clarifying.