It's harder to avoid frenemies at work than it is in your personal life. The combination of forced proximity and the natural interdependence of colleagues trying to get stuff done makes them almost impossible to avoid.
If you're a reasonable person -- and let's assume that you are -- you probably don't expect to love every single one of your co-workers. On the other hand, unless you're a terrible pessimist, or having a really rough patch in your career, you probably also don't expect to hate them all, either. Now, a new study argues that perhaps your most valuable co-worker is the one who inspires both positive and negative emotions in somewhat equal measure: the office frenemy, if you will. Here's why you need the folks you (occasionally) love to hate.