On Entourage it used to say
On Entourage it used to say when you last sent an email to that contact and also a link to that email, that was really useful
alex k commented
On Mac Office 365 - How can I see when I’ve emailed, or received an email, from someone while viewing their contact info. I used to use Entourage and this information was at the bottom of the contact screen for all contacts.
I miss the way Entourage allowed me to "link" messages. This let me group together emails that are not necessarily in a "conversation" eg: an inquiry from a customer and a quote from a vendor.