How about SPECIFIC LINKS TO SPECIFIC EMAIL THREADS!!!
For the first time (actually the second time in Outlook history), users could utilize a direct link to an email thread in their notes, i.e. so they could open one up and see what's happening without using the search feature!!!
Why not use the search feature?
Because when you search for a subject line and happen to include Outlook's "Re: " syntax, the message CANNOT be found!!!
In gmail, you can copy a link to an email THREAD (not just a message, as with so called wunderlist plugin).
This is convenient for sticking thread-links into calendar events and notes for conveniently accessing and project management.
... Outlook once had this, it would be nice to see it return.