With all of the software development manpower at Microsoft's disposal, I am not mad, but more just amazed that it is still not possible to do this basic thing, that you would have thought is one of the most central functions to having a suite of integrated apps, and the whole thing that software companies like Microsoft pride themselves on (providing tools to simplify your life).
'Email' can talk to 'to-do, yet 'to-do' cant talk back to 'email', except via a 3rd redundant browser app that you are forced to open (that, lets be honest no one uses), and opens a new tab for every separate click? Yuck.
Any convenience I get from being able to flag emails into the to-do list, is cancelled out completely. Trying to compete with Apple or not? jeez.