Let's clarify what I'm talking about first. I am TOTALLY not a client guy so please help. Open outlook 2010, see the right pane that has the calendar, tasks, maybe frequent contacts? Tasks is just empty for this user. Now if I go to the bottom left menu, select tasks, everything is there.
here's how I can re-create the issue
Move User to my New 2013 environment
Move user back to Old 2010 environment
Tasks preview is gone.
A wise man is a fool, with a good memory.